71%
of UK meters are smart
End of 2025, all fuels combined (GOV.UK, March 2026)
90%
government target by 2030
With 97% expected to operate in smart mode
1 to 6%
realistic annual saving range
BEIS impact assessment; midpoint around 3%
Why most smart meter guides oversell the savings
When you read that a smart meter saves "the average household £100 a year", the number is doing hidden work. It comes from Smart Energy GB, the supplier-funded campaign body, whose own data points to a 2 to 3% cut in energy use for homes that actively engage with the in-home display.
On the current Ofgem price cap of £1,641 a year (typical dual-fuel Direct Debit, 1 April to 30 June 2026, down 7% on the previous cap), 3% is about £49. The official BEIS impact assessment puts the realistic range at 1 to 6%, depending on whether the household actually watches the display.
The saving is real, but small, and almost all of it comes from one specific behaviour: looking at the IHD during the first three months after installation. We will return to that point because it is the single most important thing in this guide.
How a UK smart meter actually works
A second-generation UK smart meter (SMETS2) is four devices working together, not one. The meter itself measures kilowatt-hours at the unit rate of 24.67 p/kWh for electricity, 5.74 p/kWh for gas and the standing charge of 57.21 p/day. Everything else is plumbing that moves that reading to the right places.
How the four devices connect
HAN = Home Area Network (the wireless link inside your home). WAN = Wide Area Network (the mobile-signal link out of your home). DCC = Data Communications Company, the central UK relay.
Two notes. The smart meter does not use your home wifi: the HAN and WAN are separate radios in the meter and comms hub. The gas meter is battery-powered and only wakes every half-hour; the electricity meter relays the gas data on its behalf.
SMETS1 vs SMETS2: why the generation matters
Not all smart meters are the same. The original SMETS1 rollout (2011 to 2018) installed millions of meters that were tied to a single supplier's systems. The current SMETS2 generation talks to the central Data Communications Company instead, so it stays smart no matter which supplier you switch to.
What SMETS1 does badly
If you have a SMETS1 meter installed before 2018 and have since switched supplier, there is a real chance it has dropped into "dumb mode": still measuring energy correctly, but unable to send readings automatically. The IHD then displays only kilowatt-hours, not pounds and pence. The remedy is a DCC migration, handled remotely by your supplier. Exact 2026 SMETS1 migration completion rate is not in the public quarterly data.
Why SMETS2 keeps being smart after a switch
SMETS2 was designed around the DCC. When you switch supplier, the new supplier simply requests access through the DCC and the readings continue to flow. No engineer visit, no firmware swap. If a SMETS2 meter does stop sending readings, the cause is almost always signal: the comms hub cannot reach the mobile WAN.
How to tell which one you have
The simplest test: look at your IHD after switching supplier. If readings still appear in pounds and pence, you have a working SMETS2 (or a migrated SMETS1). If the display drops to kWh only and your supplier asks for manual readings, you have a SMETS1 still in dumb mode.
The IHD saving paradox
Here is the part the marketing leaflets skim over. The behavioural-economics research, including Smart Energy GB's own customer studies, points to a clear pattern in how the saving from a smart meter shows up over time:
- Weeks 1 to 6: large effect; households discover what their kettle, oven and tumble dryer actually cost;
- Weeks 6 to 12: effect tapers as new habits settle in;
- Months 4 to 6: effect largely fades unless the IHD stays visible and the household keeps glancing at it;
- Month 6 onward: behaviour reverts unless something new (a price cap change, a high bill) re-engages attention.
The saving is mostly front-loaded into the first 90 days. After that, ambient awareness keeps it alive. People who only use the supplier's app save measurably less than people with the IHD on the kitchen counter, because the app is opened a few times a month; the IHD is glanced at several times a day for free.
This is why the next point matters so much.
Refuse a smart-meter fitting that skips the IHD.
Some suppliers no longer ship the in-home display by default in 2026, citing app use. Without the IHD, you lose the only part of the system that reliably delivers the saving. Ask the engineer to leave one; if they will not, postpone and get the IHD confirmed in writing first.
2026 changes that affect smart meters
Three things have shifted in the last year and are worth knowing before you say yes or no to an install.
- Virtual WAN (VWAN): the Data Communications Company is launching a service in 2026 that lets a smart meter talk to the DCC over your home broadband, with your explicit consent, when the dedicated mobile WAN signal is too weak. This is the fix for rural homes, thick-walled buildings and high-rise flats where smart meters have previously failed;
- 4G hub rollout: older 2G/3G comms hubs are being replaced with 4G units. The replacement is free and is the most common cause of "smart meter suddenly came back to life" stories;
- The 90% target: government policy targets 90% of UK meters operating as smart by the end of 2030, with 97% in smart mode. The next official quarterly statistics update is due on 28 May 2026.
The current status, at the end of 2025, is 71% of all UK meters in smart mode (electricity and gas combined). That is a hard, public number from the GOV.UK Smart Meters Statistics Report; everything else you read in this space is a projection.
Should you accept one? The trade-off in plain English
For most households the case is reasonable, but it is much weaker than the suppliers' advertising suggests. Here is the honest balance.
Advantages
- No more estimated bills; you pay for the energy you actually used.
- No more manual meter readings to remember and submit.
- The IHD gives you a fighting chance of cutting 1 to 6% off your annual energy use.
- A SMETS2 meter stays smart when you switch supplier, unlike older SMETS1 models.
- Required for some time-of-use and dynamic tariffs that can save more if your usage is flexible.
Disadvantages
- The headline savings are modest and only materialise if you watch the IHD daily.
- SMETS1 meters can still slip into dumb mode after a switch until migrated.
- Mobile WAN coverage remains patchy in rural and high-rise locations (VWAN should help in 2026).
- Some suppliers now arrive without an IHD, which gut the saving case if you accept that.
- Half-hourly consumption data is shared with the DCC and your supplier; you can opt out of granular sharing.
What to do on installation day
The engineer will be in and out in 60 to 90 minutes. There are five specific things to ask for; none of them are optional if you want the saving to actually show up on your bill.
- Confirm the meter is SMETS2, not a refurbished SMETS1; ask the engineer to read the model number aloud;
- Insist on receiving an in-home display, even if the supplier "prefers" you to use the app;
- Ask the engineer to test the WAN signal before leaving, and to log a Virtual WAN ticket if the signal is marginal;
- Have the engineer pair the IHD to the meter in front of you and show you the live reading in pounds and pence;
- Place the IHD on the kitchen counter, not in a drawer, and look at it at least once a day for the first 90 days.
That last point sounds trivial. It is the entire saving.
Estimate your smart-meter saving
Enter your current annual energy spend (or kWh usage) and your honest answer on the in-home display. The estimate updates as you type.
UK 2026 typical: £1,641 a year (Ofgem cap, dual-fuel Direct Debit).
Your likely position: a year.
Estimates based on the 1 to 6% BEIS impact assessment range, with the midpoint anchored on Smart Energy GB's 2 to 3% finding. Passive saving (accurate billing) is held at around 1%; the rest is behavioural and depends on IHD use. Not a guarantee.
Your right to refuse
Ofgem has been unambiguous on this: smart meters are not compulsory. The 90% by 2030 target binds suppliers, not households. A supplier has to offer you a smart meter; you do not have to accept.
The "softening" you may have read about refers to the supplier-side rollout deadline, not your personal obligation. Suppliers have more flexibility, which means fewer door-step visits, but no new powers over your meter. They cannot cut your supply, refuse you a tariff or charge a fee for keeping a traditional meter.
Reasonable grounds for declining are narrower in 2026: WAN coverage concerns are handled by Virtual WAN, and data-sharing worries can be managed by opting out of granular (half-hourly) sharing while keeping the daily reading. If your reason is simply that you do not want one, that is still enough. Tell your supplier in writing and ask them to log a "customer opt-out" against your account.
For more on how energy regulation works in practice, read our guide to Ofgem and the energy market, or compare your current electricity tariff against the cap.
Frequently asked questions
No. Ofgem has confirmed smart meters are not compulsory. The government target of 90% smart meter coverage by 2030 is a supplier obligation, not a household one. You can refuse a smart meter offer and keep your current meter; suppliers cannot cut you off or block you from a tariff for refusing.
On its own, a smart meter saves nothing. The saving comes from the in-home display (IHD), which Smart Energy GB research suggests cuts typical household energy use by around 2 to 3% a year. The BEIS impact assessment puts the realistic range at 1 to 6%. The effect peaks in the first six weeks and fades by month six unless you keep the IHD visible.
SMETS1 was the first generation, installed up to 2018. It often lost smart functionality when you switched supplier. SMETS2 is the current generation: it talks to every UK supplier through the central Data Communications Company (DCC), so it stays smart after a switch. Many SMETS1 meters have since been migrated to operate over the DCC network.
It still measures energy correctly, but it cannot send readings automatically. You have to submit readings manually, like an old meter. Call your supplier; they may be able to push a firmware fix, swap the comms hub, or escalate the meter to the DCC for migration.
Yes, if your name is on the energy bill. Tell your landlord first (a tenancy clause may require it) and book the installation with your supplier. If your landlord pays the bill and you do not, only they can arrange one.
Virtual WAN (VWAN) is a 2026 Data Communications Company service that lets a smart meter connect to the DCC over your home broadband when the dedicated mobile WAN signal is too weak. With your consent, it solves coverage problems in rural areas, thick-walled homes and high-rise flats where smart meters have previously failed.