Smart meters automatically track your gas and electricity use, whether you have solar power or not. They do this by measuring the flow of electricity and voltage regularly, then calculating your average and total usage. This info is displayed for you.
Your smart meter can send this data to your energy supplier through a network called the Data Communications Company (DCC). Older smart meters use 3G to transmit data. With a smart meter, you don’t need to manually read and send meter readings. Your supplier bills you based on the data they get, so you pay for what you actually use.
If you have solar panels and they produce more energy than you need, the excess is sent to the National Grid. Your smart meter won’t run backward like an old meter would. Instead, it might show a message like ‘rEd’ or ‘Reverse energy detected’.