A smart meter is the next generation of a gas and electricity meter – replacing the outdated analog meters. It keeps track of how much gas and electricity you're using, as well as what it's costing you, and lets you see that in near-real time.
The smart meter shows a digital meter reading and uses a secure smart data network to automatically send the reading to your energy supplier. That means you get accurate, not estimated bills, without needing to take a manual reading.
When you get smart meters installed, you'll also normally get a small portable device with a screen that shows your energy usage or prepayment balance. This is called an ‘in-home display’ (IHD) or a ‘smart energy monitor’.