Best Smart Plugs With Energy Tracking (2026)

Energy-tracking smart plugs measure one connected plug-in device. Depending on the model, they can expose current power draw, cumulative energy use, and consumption history. They are useful for investigating selected appliances, but they are not whole-home monitors or billing meters.

This research-based guide compares five energy-monitoring plugs across different budgets, protocols, and ecosystems. We have not run a controlled accuracy test across 20 plugs; consult current manufacturer documentation when measurement precision is critical.

What a smart plug can—and cannot—measure

An energy-tracking plug can measure the load passing through its own outlet. It may report watts, voltage, current, cumulative kWh, estimated cost, or history, but the available sensors and retention differ by model, region, app, and integration.

It cannot provide:

• whole-home consumption or the output of hardwired circuits;
• total solar production unless that exact load is routed through supported equipment;
• billing-grade accuracy without an appropriate certified meter;
• safe control of an appliance beyond the plug’s and appliance’s ratings.

For panel and circuit visibility, see our whole-home energy monitor guide. For P1, HAN, optical, or utility data, use the smart-meter reader guide.

Buying criteria that matter

• Power and energy entities: Check for cumulative kWh as well as real-time watts.
• History and export: Confirm how much history the app stores and what Home Assistant can retain.
• Local versus cloud: Basic switching and detailed energy history may follow different paths.
• Update interval: Slow reporting can hide short peaks or make threshold automations unreliable.
• Electrical rating: Match voltage, current, load type, and regional plug standard.
• Integration support: Verify the exact model and firmware, not only the brand.
• Measurement tolerance: Use manufacturer documentation and avoid treating consumer plugs as billing instruments.

Why Energy Tracking Matters

Before we get to the picks, let’s talk about why you should care about energy monitoring at the plug level.

Identify Vampire Loads

Many devices draw power while apparently idle. A smart plug can quantify that draw over time, after which you can calculate cost using your own tariff. Do not cut power automatically when a device requires standby power for safe operation, updates, frost protection, connectivity, or a controlled shutdown.

Find High-Draw Appliances

That old mini-fridge in the garage? It might be costing you $25/month. Space heaters, dehumidifiers, and aging appliances often draw far more power than you’d expect. Energy-tracking plugs give you real data to make informed decisions about replacements.

Automate Based on Usage

Advanced smart plugs can trigger automations when power draw changes. For example: turn off a smart plug when a washing machine’s power draw drops below 5W (indicating the cycle is done), and send a notification. Or automatically cut power to a charger once a device reaches full charge.

Track Costs Over Time

Most energy-tracking plugs calculate your costs based on your electricity rate. Over weeks and months, you build a clear picture of where your money goes—and where you can save.

Our Top Picks

1. TP-Link Kasa KP125M — Best Overall Value

The Kasa KP125M combines Matter support over WiFi with energy-monitoring features in the Kasa app, including real-time wattage, usage history, and estimated costs. Pricing varies by retailer. We have not independently verified a ±1% accuracy figure.

Matter compatibility means it works natively with Apple Home, Google Home, Amazon Alexa, and Samsung SmartThings without cloud dependencies for basic control. Energy data is still routed through the Kasa app for detailed history, but on/off control works locally through any Matter controller.

The compact design doesn’t block adjacent outlets, and it handles up to 15A (1,800W). Setup takes under 2 minutes via the Kasa app with Matter QR code pairing. For most people, this is the only smart plug you need to consider.

Price: $15 | Protocol: WiFi + Matter | Max Load: 15A / 1,800W

2. Eve Energy — Best for Privacy and HomeKit

Eve has always prioritized privacy, and the Eve Energy continues that tradition. It processes all energy data locally—nothing goes to a cloud server unless you explicitly enable it. The plug communicates via Thread (with Matter support), providing a fast, reliable, low-power mesh network connection.

Energy tracking in the Eve app is exceptionally detailed, showing real-time consumption, projected monthly costs, and historical data going back years. The app also estimates your carbon footprint based on your energy source mix.

At $40, it’s significantly more expensive than the Kasa, but you’re paying for Thread protocol (more reliable than WiFi for smart home devices), complete privacy, and the best energy visualization of any smart plug app. It also works seamlessly within a broader Matter-compatible device setup.

Price: $40 | Protocol: Thread + Matter | Max Load: 15A / 1,800W

3. Aqara Smart Plug — Best for Zigbee Ecosystems

If you’re running a Zigbee-based smart home with an Aqara hub or a Zigbee coordinator like the SONOFF ZBDongle, the Aqara Smart Plug is an excellent energy-monitoring option at $20. It uses Zigbee 3.0, which means local communication, low latency, and no reliance on WiFi bandwidth.

Energy monitoring reports wattage, voltage, current, and cumulative energy consumption. Data updates every 10 seconds in the Aqara app, and every measurement is accessible via the Zigbee protocol for use in Home Assistant or other platforms.

The plug also acts as a Zigbee router, extending your mesh network’s range—useful in large homes. The 2,500W (10A at 250V) maximum load makes it suitable for most household appliances in regions with 220-240V mains.

Price: $20 | Protocol: Zigbee 3.0 | Max Load: 10A / 2,500W (at 250V)

4. Shelly Plug S — Best for Home Assistant and Local Control

The Shelly Plug S is commonly considered for Home Assistant because documented local interfaces can reduce cloud dependence. Check the exact regional model and firmware for supported APIs, setup requirements, and protocol availability before purchase.

Shelly documents reporting for real-time power, voltage, current, power factor, and total energy consumed. Check the exact regional Plug S model and its published metering tolerance; we have not independently verified a ±1% figure. Its local interfaces remain the main reason to consider it for Home Assistant.

The Shelly app is functional but basic compared to Kasa or Eve. Where the Shelly Plug S shines is in its open architecture—flash custom firmware (like Tasmota or ESPHome), set up automations locally, or integrate directly with Home Assistant’s energy dashboard for whole-home tracking.

Price: $20 | Protocol: WiFi (local API, MQTT) | Max Load: 12A / 2,500W

5. Tapo P110 — Best Budget Option

TP-Link’s Tapo P110 delivers energy monitoring at the lowest price point we’d recommend: $13. At this price, you get real-time wattage monitoring, daily/monthly consumption history, and cost estimates in the Tapo app. It’s WiFi-based and works with Alexa and Google Home.

The Tapo P110 is useful for identifying high-draw devices and consumption trends, but we have not independently verified a ±3% accuracy figure. Do not treat it as a calibrated billing meter. Check the current app and export functions for your region before buying.

The main limitations are no Matter support and no local API. All data routes through TP-Link’s cloud, and advanced energy automations are limited to what the Tapo app offers. But at $13, it’s hard to argue with the value for basic energy tracking needs. If you’re starting a smart home from scratch, these are great affordable entry points.

Price: $13 | Protocol: WiFi | Max Load: 15A / 1,800W

Comparison Table

Plug	Price	Protocol	Energy Accuracy	Matter Support	Max Load	App Quality
TP-Link Kasa KP125M	$15	WiFi + Matter	Verify current tolerance	✅ Yes	15A / 1,800W	Excellent
Eve Energy	$40	Thread + Matter	Verify current tolerance	✅ Yes	15A / 1,800W	Excellent
Aqara Smart Plug	$20	Zigbee 3.0	Verify current tolerance	❌ No (via hub)	10A / 2,500W	Good
Shelly Plug S	$20	WiFi (local API)	Verify exact model	❌ No	12A / 2,500W	Basic
Tapo P110	$13	WiFi	Trend monitoring	❌ No	15A / 1,800W	Good

How to Use Energy-Tracking Plugs Effectively

Monitor First, Automate Later

Start by plugging in your energy monitor and just observing for a week. You’ll quickly identify which appliances use the most power and which have significant standby draw. Then create automations to address the biggest offenders.

Track Seasonal Changes

Energy usage varies dramatically by season. Your space heater, dehumidifier, or window AC unit might cost $50+/month during their active season. Track these over time to understand your true annual energy costs per device.

Create an Energy Budget

Once you know what each device costs, set monthly energy budgets. Many apps allow alerts when a plug exceeds a set kWh threshold, helping you stay aware of creeping usage.

Combine with Whole-Home Monitoring

Smart plugs give device-level detail, while a whole-home monitor or compatible meter reader supplies the household boundary. In the Home Assistant Energy Dashboard, compatible cumulative-energy sensors can appear as individual devices alongside grid data. Avoid adding the same load in a way that double-counts totals.

Group by Room or Category

If you have multiple energy-tracking plugs, group them by room (home office, entertainment center, kitchen) or category (always-on devices, seasonal devices) to understand consumption patterns at a higher level.

Best Practices for Smart Plug Placement

Not every outlet needs an energy-tracking plug. Focus on:

• Entertainment centers — TVs, soundbars, gaming consoles, and streaming devices often have high standby draw
• Home office — Monitors, computers, printers, and chargers add up quickly
• Kitchen appliances — Coffee makers, instant pots, and countertop appliances
• Seasonal devices — Space heaters, fans, dehumidifiers, and window AC units
• Suspect appliances — Old fridges, chest freezers, or any device you think might be drawing excessive power

Most of these plugs fall under $50, making them accessible additions to any smart home budget.

Ecosystem Integration

All of these plugs work within broader smart home ecosystems. Here’s how they fit:

• Apple Home — Eve Energy (native Thread) and Kasa KP125M (via Matter)
• Google Home — Kasa KP125M (Matter or native), Tapo P110 (native)
• Amazon Alexa — All five plugs work with Alexa
• Home Assistant — Shelly Plug S (best, local), Aqara (via Zigbee), all others via integrations
• Samsung SmartThings — Kasa KP125M (Matter), Aqara (via hub)

See how we compare products for our full methodology.

FAQ

Do all smart plugs track energy usage?

No, most basic smart plugs only offer on/off control and scheduling. Energy monitoring is a premium feature found in specific models. Always verify that “energy monitoring” or “power metering” is listed in the product specifications before purchasing.

How accurate are smart plug energy readings?

Accuracy varies by model, firmware, load, voltage, and region. Check the manufacturer’s current metering tolerance and use a calibrated meter when billing-grade accuracy matters. Smart plugs remain useful for identifying high-draw devices and trends.

Can smart plugs handle high-wattage appliances?

Ratings vary by model, region, voltage, current, and load type. A resistive maximum does not automatically make a plug suitable for motors, compressors, heaters, EV charging, or other high-startup or continuous loads. Never exceed the lowest applicable rating, and follow both the plug and appliance manufacturer’s instructions. Use suitable fixed electrical equipment and a qualified installer where required.

Do energy-tracking smart plugs work without internet?

It depends on the model. The Shelly Plug S and Aqara Smart Plug work completely locally without internet. The Eve Energy works locally via Thread/HomeKit. The Kasa and Tapo plugs require internet for initial setup and cloud features, but basic Matter control works locally after setup.

Can I export energy data from smart plugs?

The Shelly Plug S offers the most flexible data export via its local API and MQTT. Home Assistant can log data from any of these plugs into its long-term statistics database. The Eve app exports CSV data. Kasa and Tapo offer in-app viewing but limited export options.

Final Verdict

The TP-Link Kasa KP125M is our top research-based recommendation for most users when competitively priced, because it combines Matter support and energy monitoring in a compact plug. Privacy-conscious Apple users should consider the Eve Energy, while Home Assistant enthusiasts may prefer the Shelly Plug S for its local interfaces.

Start with one or two high-draw or always-on devices and monitor them for a month. Savings depend on the appliances, tariff, and whether automation changes actual usage; payback is not guaranteed.