Buyer's guide
Best Home Energy Monitors UK 2026
You can't cut what you can't see. A home energy monitor turns your electricity use into a live, readable number — watts now, pounds this month — and almost everyone who fits one finds an always-on drain they didn't know about: an old fridge-freezer, a games console in standby, an immersion heater on the wrong timer.
There are three broad types, at very different prices and effort levels. Below we rank a pick in each, then explain how they compare to the free in-home display your energy supplier already gave you — because for some households that display is all they need.
The verdict
For a true picture of your whole home, a CT-clamp monitor like the Emporia Vue is the best value in the category — circuit-level detail for well under £100. Smart-home tinkerers should look at Shelly's EM range; anyone who just wants one appliance measured needs nothing more than a £15 plug-in meter. And if you only want your total daily cost, check your supplier's in-home display first — it's free.
Top pick: Emporia Vue (whole-home CT-clamp monitor)
Our top picks by role
Emporia Vue
£50–£110
CT clamps fit around the cables in your consumer unit and report whole-home use — plus individual circuits if you add clamps — to a clear app. Remarkable detail for the money.
Pros
- Circuit-by-circuit breakdown
- Excellent value
- Good app and data export
Cons
- Fitting needs care near the consumer unit
- App account required
Shelly EM / Pro EM
£40–£120
A favourite of the Home Assistant crowd. Local control, no forced cloud, and it slots straight into an existing smart-home setup for automations based on real power use.
Pros
- Works locally, privacy-friendly
- Integrates with Home Assistant
- Compact DIN-rail options
Cons
- Aimed at tinkerers
- Fitting is an electrical job
Plug-in power meter
£12–£25
The cheapest way to answer 'what does this cost to run?'. Plug it between the socket and an appliance and read watts, kWh and running cost. Perfect for hunting down energy vampires.
Pros
- Cheap and foolproof
- No installation
- Great for spot-checks
Cons
- One appliance at a time
- No whole-home picture
Standalone in-home display (Owl / Geo)
£30–£60
A classic clip-on-the-meter display for a single at-a-glance number, no phone required. Useful if you specifically don't want an app — but a free supplier display often does the same job.
Pros
- No app or account
- Always-on glance value
- Simple for any household
Cons
- Less detail than app-based rivals
- Supplier's free display may cover it
The three types, and who each suits
- Whole-home CT-clamp monitors (Emporia Vue, Shelly EM): the fullest picture, showing total and per-circuit use. Best for anyone serious about cutting a bill.
- Plug-in meters: a few pounds, measure one appliance, need no wiring. Best for spot-checking suspects.
- In-home displays: a single always-on number. Best for households that just want awareness without an app — but check your free supplier display first.
How these differ from your free smart-meter display
If you have a smart meter, your supplier gave you an in-home display (IHD) that already shows real-time use and cost, pulled straight from the meter. For many people that's genuinely enough, and it costs nothing. A bought monitor earns its place when you want more than the IHD offers: per-circuit or per-appliance detail, long-term data you can export, or integration with a smart-home system.
So the honest first step is free: dig out your supplier's IHD (or ask for a replacement if it's stopped working — common with British Gas, Octopus and E.ON meters) and see whether it answers your question before you spend anything.
What real savings look like
Monitors don't save energy on their own — they show you where to act. The typical wins are dull but real: switching off a second fridge or freezer that's barely used, fixing heating and hot-water timers, and killing standby loads on AV kit and desktops. Most households find somewhere between £50 and £150 a year once the always-on baseline is visible. The monitor pays for itself in a season.
Who it's for
- Bill-conscious households wanting to find always-on waste
- Smart-home users automating on real power data (Shelly)
- Renters and quick-fixers who just need a plug-in meter
- Anyone whose free supplier in-home display has stopped working
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