Energy-monitoring smart plugs are one of the few smart-home products that answer a question you actually have: what is this appliance costing me? They are also one of the categories where the marketing oversells what the data can do. A plug reports power draw at the socket; it cannot tell you why the number is what it is.

This review covers four plugs that monitor consumption, with what each is good for and where the data should be treated with caution. We have not run instrumented accuracy tests; the assessment below is based on published specifications, app capabilities and the measurement method each product uses.

Home appliances and smart devices on a kitchen counter
Monitoring pays off on appliances that run for hours — not on lamps and phone chargers.

What these plugs measure, and what they do not

A monitoring plug measures voltage, current and power factor at the socket, and multiplies them to report watts. Over time it integrates that into kilowatt-hours.

Where that is useful: appliances with steady loads — heaters, dehumidifiers, fridges, pumps, older white goods, always-on computing.

Where it is less useful: anything with a motor that cycles on and off, appliances with inverters, and devices drawing a watt or two in standby. On those, you will see noisy readings that still reveal a pattern over a week.

Where it is wrong to expect anything: the plug cannot attribute cost inside a device. It can tell you a gaming PC costs a certain amount per evening; it cannot tell you whether that is the GPU or the monitor.

The four plugs

Best value smart plug with energy monitoring

TP-Link Tapo P110M Smart Plug

A compact plug with power monitoring and Matter support, so it works with the major smart-home platforms without a proprietary hub. The value pick of the category.

Why it works

  • Matter support means it works across platforms
  • Consumption history makes appliance costs visible
  • Inexpensive enough to buy several

What to weigh up

  • Needs a 2.4GHz Wi-Fi network
  • App account required for remote control and history
Protocol: Matter over Wi-Fi (published)Monitoring: Real-time and historical power consumptionFeatures: Schedules, timers, away mode, overload protectionSize: Compact enough to leave an adjacent socket usable on most models
Check current priceat Amazon · checked September 10, 2026 ·how these links work
Where else to look

Specifications in this card come from the manufacturer's published material — see the sources list at the end of this guide. We do not publish prices because they change weekly.

The default recommendation. Matter over Wi-Fi means it works with Apple Home, Google Home, Amazon Alexa and SmartThings, the monitoring data is clear, and the price is low enough to buy several.

Best simple energy-monitoring plug

Kasa EP25 Smart Plug

A straightforward plug with energy monitoring and a stable app. No Matter support on older stock, so check the model generation if cross-platform control matters to you.

Why it works

  • Reliable, well-established app and firmware
  • Consumption reporting is clear and exportable
  • Compact housing

What to weigh up

  • Matter support varies by model generation
  • Requires the manufacturer account rather than a local protocol
Protocol: Wi-Fi with app controlMonitoring: Real-time and cumulative energy useFeatures: Schedules, timers, away mode
Check current priceat Amazon · checked September 10, 2026 ·how these links work
Where else to look

Specifications in this card come from the manufacturer's published material — see the sources list at the end of this guide. We do not publish prices because they change weekly.

A dependable, simple option with an established app. Check the specific model generation if you want Matter support rather than the manufacturer’s own ecosystem.

Best for privacy-focused homes

Eve Energy Smart Plug

A plug that supports Matter over Thread and can run locally rather than through a vendor cloud — the choice for people who dislike smart-home accounts on principle.

Why it works

  • No mandatory vendor cloud account
  • Thread networking is responsive and low power
  • Accurate energy measurement

What to weigh up

  • Requires a Thread border router
  • Pricier than Wi-Fi plugs
  • Fewer scheduling conveniences in a standalone app
Protocol: Matter over Thread (published)Monitoring: Energy and power consumption measurementLocal control: Works with Matter controllers, with local operation supportedRequirement: Needs a Thread border router such as a modern smart-home hub or speaker
Check current priceat Amazon · checked September 10, 2026 ·how these links work
Where else to look

Specifications in this card come from the manufacturer's published material — see the sources list at the end of this guide. We do not publish prices because they change weekly.

For households that dislike cloud accounts: Matter over Thread, local operation and accurate measurement. It needs a Thread border router, which many modern smart speakers already provide.

Best for tinkerers and local automation

Shelly Plug US

A plug for people who want to automate things themselves: local APIs, MQTT support and integration with open-source home automation platforms, with energy monitoring included.

Why it works

  • Local control without a cloud dependency
  • Scriptable and integrates with automation platforms
  • Energy monitoring included

What to weigh up

  • Setup assumes technical comfort
  • App is less polished than mainstream brands
Protocol: Wi-Fi with local API and MQTT supportMonitoring: Power and energy measurementIntegration: Works with common open-source automation platforms
Check current priceat Amazon · checked September 10, 2026 ·how these links work
Where else to look

Specifications in this card come from the manufacturer's published material — see the sources list at the end of this guide. We do not publish prices because they change weekly.

For people who automate everything themselves: a local API, MQTT support and integration with open-source automation platforms, with energy monitoring included.

How to use the data

  1. Baseline for a week before changing anything. Single readings mislead; weekly totals reveal the appliances that matter.
  2. Convert to money, not watts. Most apps do this. Kilowatt-hours multiplied by your tariff is the number that changes behaviour.
  3. Compare against the label. If an old fridge draws notably more than its rated consumption, cleaning coils or replacing it becomes a concrete decision rather than a guess.
  4. Hunt standby loads deliberately. One at a time, over days, not all at once.
Tapo P110M Kasa EP25 Eve Energy Shelly Plug US
Ecosystem Matter over Wi-Fi Manufacturer app (generation dependent) Matter over Thread Local API and app
Energy monitoring Yes Yes Yes Yes
Needs a hub No No Yes (Thread border router) No
Local control Limited Limited Yes Yes
Best for Most households Simple setups Privacy-focused homes Automation hobbyists
Watch out for Requires 2.4GHz Wi-Fi, app account Matter support varies Border router requirement Technical setup

Where monitoring pays for itself

The clearest returns come from appliances you use daily and are unsure about: a dehumidifier running all winter, a space heater used instead of central heating, a second fridge in a garage, a home server or gaming rig that is on for hours every evening. Those are the cases where a few weeks of data changes a decision — whether to replace, whether to schedule, or whether to simply stop using it during peak hours.