Best Smart Plugs with Energy Monitoring in 2026

A smart plug with energy monitoring doesn't just give you remote control of your outlets — it tells you exactly what your devices cost to run. Plug in a tumble dryer and you'll learn how expensive each cycle really is. Connect a gaming PC or a wine fridge and you might be surprised. Over time, that data helps you eliminate phantom loads, optimise appliance timing, and genuinely reduce your electricity bill.

We tested three of the best energy-monitoring smart plugs in 2026 across accuracy, app quality, and smart home platform support.

Why Energy Monitoring Matters

The average UK household has 30–40 devices plugged in at any given time, many drawing standby power continuously. Studies suggest standby power accounts for roughly 10–15% of home electricity consumption. Smart plugs with energy monitoring help you identify the worst offenders and build automations to cut them off automatically.

More sophisticated use cases include:

• Appliance-done notifications: Detect when the washing machine or dishwasher drops to idle power and send a push notification.
• Energy cost dashboards: Track kWh consumption over days, weeks, and months with some apps.
• Home Assistant energy monitoring: Feed plug data into HA's Energy dashboard for household-level energy insights.
• Fault detection: Spot unusual consumption patterns that might indicate appliance problems.

1. Kasa EP25 — Best All-Rounder

The Kasa EP25 from TP-Link is our top pick for most people. It's Matter-certified (one of the first budget plugs to achieve this), which means it works natively with Apple Home, Google Home, Alexa, and Home Assistant without any cloud dependencies for basic control.

The energy monitoring is accurate to within 2–3% of our reference clamp meter, which is excellent for a consumer plug at this price. The Kasa app shows real-time wattage, daily/weekly/monthly kWh consumption, and cost estimates (once you enter your electricity tariff). The interface is clean and the data is easy to interpret.

Physically, the EP25 is compact enough not to block the adjacent outlet on a double socket — a common frustration with larger smart plugs. It handles up to 15A / 1800W, covering most household appliances short of full electric cookers.

Home Assistant integration works via the Kasa integration (local API) or via Matter — both are reliable. The Matter path is easier to set up; the Kasa local API gives slightly more granular data including historical energy readings.

Kasa EP25 — Key Specs

• Connectivity: Wi-Fi 2.4GHz + Matter
• Max load: 15A / 1800W
• Energy monitoring: Yes (wattage, kWh, cost)
• Works with: Alexa, Google Home, Apple Home (via Matter), Home Assistant
• Physical size: Compact (doesn't block adjacent socket)

2. Eve Energy — Best for Apple HomeKit

Eve Energy is the smart plug of choice for Apple households, and for good reason. It's one of the few consumer smart plugs with native Thread support, paired with full HomeKit certification. Thread gives it ultra-fast response times and strong reliability — the plug responds in under half a second consistently, even when the home hub is busy.

The energy monitoring integrates directly into the Apple Home app and the dedicated Eve app. In Home, you'll see current wattage on the device tile. The Eve app provides detailed consumption history, cost calculations, and a power flow timeline — one of the better energy monitoring UIs available.

All data stays local. Eve doesn't use a cloud server for device control or energy data — everything runs through Thread and your Apple home hub (HomePod, Apple TV, or iPad). For privacy-conscious users, this is a significant advantage.

The downsides: Eve Energy is iOS/macOS only and doesn't work with Android, Alexa, or Google Home natively. If you have a mixed-platform household, look elsewhere. It's also pricier than the Kasa EP25.

Eve Energy — Key Specs

• Connectivity: Thread + Bluetooth (Matter over Thread)
• Max load: 16A / 3680W (EU) / 10A / 1200W (US)
• Energy monitoring: Yes (wattage, kWh, cost, consumption history)
• Works with: Apple Home native; Home Assistant (via HomeKit Controller)
• Local control: Yes — no cloud dependency

3. Shelly Plug US — Best for Home Assistant

The Shelly Plug US (and its international counterpart, the Shelly Plug S) is the definitive smart plug for Home Assistant power users. Shelly's firmware exposes a full local REST API, MQTT support, and direct integration with Home Assistant via the official Shelly integration — no cloud account required.

The energy monitoring is among the most accurate we've tested. In our comparisons against a reference clamp meter, the Shelly Plug US was consistently within 1–2% across a range of loads from 5W (LED lamp) to 1500W (space heater). That level of accuracy opens up genuine energy management applications rather than just rough ballpark figures.

The Home Assistant integration exposes all energy data as entities: current wattage, voltage, current (amperes), kWh today, kWh this month, and historical data. All this feeds directly into HA's Energy dashboard for comprehensive whole-home energy monitoring.

The Shelly app is functional but not polished. For users who live in Home Assistant, that's irrelevant. But it does mean the out-of-the-box experience for non-technical users is less friendly than Kasa or Eve.

Shelly Plug US — Key Specs

• Connectivity: Wi-Fi 2.4GHz (local API + MQTT)
• Max load: 15A / 1800W
• Energy monitoring: Wattage, voltage, current, kWh (daily/monthly)
• Works with: Home Assistant (native), Alexa, Google Home
• Local control: Yes — full REST API and MQTT, no cloud required

Side-by-Side Comparison

Smart Plug Buying Guide

Before purchasing, consider these key factors:

• Maximum load: Check the amperage rating. Most household devices are under 10A, but heaters and kettles can hit 13–15A. Don't use an undersized plug with a high-draw appliance.
• Plug blocking: Bulky smart plugs block adjacent sockets. Look for compact designs like the Kasa EP25 if space is tight.
• Protocol: Matter is the future. Wi-Fi plugs work fine but consume more power themselves (~1W standby). Thread plugs consume less and respond faster.
• Reporting interval: Some plugs only update energy data every 60 seconds; others update every second. For appliance-done automations, faster reporting is better.

Our Verdict

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