Guides
Smart meters and switching energy supplier in the UK: what changes?
How smart meters work with energy switching, SMETS1 vs SMETS2, in-home displays, and what to expect on switch day—without the jargon.
Smart meters send readings automatically so you are not crawling under the stairs with a torch—but many people worry switching supplier will “break” the meter. Here is a calm overview of how smart meters and energy switching interact in the UK.
First-generation (SMETS1) vs second-generation (SMETS2)
- SMETS1 meters were the earlier national rollout. Some temporarily lost smart functionality after switching until enrolled on the DCC national network—many have now been remote-updated or adapted, but experiences vary by meter model and region.
- SMETS2 meters are designed to retain smart features across supported switches more reliably when used with compatible suppliers and systems.
If you do not know which you have, check your in-home display, supplier app, or the meter label—or ask your current supplier.
Do you need a new smart meter to switch?
No—switching supplier does not require a smart meter. If you have a traditional meter, you continue to submit readings (or your new supplier will agree a process). If you have a smart meter, the new supplier will usually attempt to take over the same device.
Switch day: what typically happens
On the switch date, your new supplier becomes responsible for billing. For a period, final readings from the old supplier and opening readings for the new one must align—smart meters reduce manual errors but statements can still need a one-off reconciliation.
In-home display (IHD)
Your IHD shows near-real-time use. After switching, it may need re-pairing or a software refresh—contact the new supplier if figures look stuck. Lack of IHD data does not always mean the meter is not working remotely.
Prepayment smart meters
Prepay smart meters can often be topped up via app, shop, or key/card depending on setup. Switching while on prepay follows specific rules—confirm with both suppliers whether you stay on prepay or move to credit billing.
Privacy and data
Suppliers use consumption data for billing and regulated purposes. Read their privacy notice if you want detail on retention and analytics.
Myth-busting
- “I cannot switch with a smart meter.” — In most cases you can; functionality may vary briefly during migration.
- “Smart meters always save money.” — They help visibility; savings come from usage behaviour and tariff choice.
Doorstep Savings
We help you read your bill and kit without judgement—arrange a visit or call if smart metering and switching feels tangled.