A smart electricity meter uses electricity from the supply that goes into your home - so it won't record on the meter and you won't be billed for the electricity it runs on.

Your in-home display – the small touchscreen device that shows your home energy use – is powered by your electricity supply. It uses a very small amount of energy and costs between 70p and £1 a year to run.

In fact, smart meters usually save you money. This is because they can inspire changes to your household habits that leads to a reduction in energy consumption.