# Smart meter bills explained

> Bills & utilities · Last updated 4 July 2026

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## Quick answer

Smart meters send automatic readings to suppliers — ending estimated bills but in-home displays help track usage and identify high-consumption appliances.

Smart meters send automatic readings to your supplier, which ends estimated bills and catch-up direct debits. You can refuse installation in England and Scotland, though suppliers may still replace unsafe traditional meters. This guide explains how smart meters affect your bills and your rights.

## Key facts

- SMETS2 meters stay smart when switching supplier — older SMETS1 may revert to dumb mode temporarily
- In-home display shows live usage in pounds and kilowatt hours — helps spot wasted standby power
- Automatic readings end estimated bills and large catch-up direct debits when readings were wrong
- Suppliers cannot force installation — but may replace unsafe traditional meters without smart functionality

## How bills change

Automatic readings make monthly direct debits smoother because your supplier bills you for actual usage rather than estimates. You should still review unit rates and standing charges separately, as a smart meter does not automatically mean you are on the cheapest tariff.

Time-of-use tariffs such as Economy 7 need a smart or dual-rate meter to work properly. Your in-home display shows peak versus off-peak consumption, which helps you shift usage to cheaper periods.

## Switching suppliers

SMETS2 meters should hand over remotely to a new supplier when you switch, so you do not need to submit a manual reading on switch day. This removes one of the main frictions that put people off changing energy provider.

If your meter goes 'dumb' after switching and stops sending automatic readings, your new supplier must restore smart services or offer an appointment to fix the connection. SMETS2 meters should stay smart across supplier switches.

## Privacy and data

Half-hourly consumption data stays with your supplier under strict licence conditions regulated by Ofgem. Suppliers cannot sell your detailed usage data freely to third parties.

You own your consumption data and can request an export if you move to a new home that already has a smart meter fitted. This can help you compare usage patterns between properties.

## Frequently asked questions

### Can I refuse a smart meter?

Yes — you can ask to keep a traditional meter, though faulty meters must still be replaced for safety even if the replacement is not a smart meter. Smart meters are encouraged but not compulsory for existing working meters.

### Do smart meters save money alone?

No — the meter itself does not cut your bills. Savings come from changing behaviour after you see usage patterns on the in-home display and from switching to a better tariff.

### Are there health concerns?

Public Health England found smart meter radio frequency exposure well below international safety guidelines. The power level is comparable to other common household wireless devices.

## Primary source

https://www.gov.uk/guidance/smart-meters-how-they-work

## Related

- [Energy switching guide](https://moneyguide.org.uk/bills-utilities/energy-switching-guide/)
- [Standing charge explained](https://moneyguide.org.uk/bills-utilities/standing-charge-explained/)

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Independent UK money guidance from [Money Guide](https://moneyguide.org.uk). Information only — not regulated financial advice.