Best Smart Plugs With Energy Monitoring in 2026: Stop Guessing What's Eating Your Electric Bill

My electric bill jumped $47 last month, and I had no idea why. Same habits, same appliances — or so I thought. Turns out my fifteen-year-old chest freezer in the garage was pulling way more power than it should. I only figured this out after I plugged it into a smart plug with energy monitoring. That single discovery paid for every smart plug I own within two months.

If you've ever stared at your electricity bill wondering where the money goes, a smart plug with built-in energy monitoring is the most practical smart home purchase you can make. Not the flashiest — no one's showing off their smart plug on Instagram — but genuinely useful in a way that most smart home gadgets aren't.

I've been testing smart plugs for two years now. Here are the ones that actually deliver accurate energy data and reliable automation.

Smart home electrical outlet and devices setup

Why Energy Monitoring Matters More Than You Think

Most smart plugs let you turn things on and off remotely. That's fine, but it's table stakes. Energy monitoring adds a layer that actually saves you money:

  • Identify energy vampires — Some devices pull significant power even when "off." Your TV setup, gaming console, and old desktop might be costing you $10-15/month in standby power.
  • Track consumption patterns — See exactly when and how much power each device uses. That window AC unit? You'll know if it's running efficiently or struggling.
  • Set usage alerts — Get notified when a device exceeds a power threshold. Useful for catching problems early (a dehumidifier pulling double its normal wattage might need a filter change).
  • Calculate actual costs — Most apps let you input your electricity rate so you see real dollar amounts, not just kilowatt-hours.

The 5 Best Smart Plugs With Energy Monitoring

1. TP-Link Kasa Smart Plug KP125M (Matter) — Best Overall

TP-Link got it right with this one. The KP125M is their Matter-compatible smart plug with built-in energy monitoring, and it checks every box I care about.

The energy data is surprisingly accurate — I tested it against a dedicated Kill-A-Watt meter and the readings were within 2% consistently. The Kasa app shows real-time wattage, daily/weekly/monthly consumption in kWh, and estimated cost based on your electricity rate.

Because it supports Matter, this plug works with Apple Home, Google Home, Amazon Alexa, and Samsung SmartThings without needing the Kasa app for basic control. But you'll still want the Kasa app for the detailed energy dashboards — that data isn't exposed through Matter yet.

The plug itself is compact enough that it won't block the adjacent outlet on most wall plates. It only occupies one socket, which sounds obvious but some smart plugs are so bulky they effectively take up both.

Price: ~$17
Protocol: WiFi + Matter
Accuracy: Excellent (within 2% of Kill-A-Watt)
My take: This is the one I recommend to everyone. It just works.

2. Eve Energy (Matter) — Best for Apple Households

Eve has been the premium brand in smart home accessories for years, and the Eve Energy shows why. The build quality is noticeably better than budget plugs — it feels solid, not like cheap plastic that'll crack if you look at it wrong.

Energy monitoring is detailed and accurate. The Eve app provides beautiful charts of power consumption over time, and because Eve is serious about privacy, all data processing happens locally. Nothing gets sent to a cloud server.

The current version supports Matter over Thread, which means it needs a Thread border router (Apple TV 4K, HomePod Mini, or a compatible router). If you're in the Apple ecosystem, this is a non-issue. If you're not, look elsewhere.

Price: ~$40
Protocol: Matter over Thread
Accuracy: Excellent
My take: Premium price for premium quality. Worth it if you're Apple-only and care about privacy.

3. Tapo P110M — Best Budget Pick

The Tapo P110M is TP-Link's budget line, and at around $12, it's the cheapest way to get reliable energy monitoring in a smart plug. The Tapo app is slightly less polished than the Kasa app, but the energy monitoring features are nearly identical.

I ran this alongside the KP125M for a month, monitoring the same devices (I used a power strip to split the load). The energy readings were within 3% of each other, which is perfectly acceptable for household use.

Like the KP125M, it supports Matter, so ecosystem compatibility isn't an issue. The form factor is similarly compact. Honestly, the main difference between this and the KP125M is the app experience and slightly less precise energy data.

Price: ~$12
Protocol: WiFi + Matter
Accuracy: Good (within 3-4%)
My take: If you want to monitor 5-10 devices without spending a fortune, buy these in bulk.

Smart plug connected to home appliance for energy tracking

4. Shelly Plus Plug S — Best for Power Users

The Shelly Plus Plug S is for people who want to go deeper than "how much power is my toaster using." It supports MQTT, runs a local web server, and integrates natively with Home Assistant. If you're running a home automation setup, this is your plug.

Energy monitoring is accurate and the historical data is stored locally on the device (no cloud dependency). You can set up automations based on power consumption — for example, turn off a plug if wattage exceeds a threshold, or send a notification when your washing machine's power draw drops (meaning the cycle is done).

The "washing machine done" automation alone makes this plug worth owning. My partner used to forget about laundry for hours. Now we get a phone notification the moment the cycle ends. Small thing, big quality of life improvement.

Price: ~$18
Protocol: WiFi + MQTT + HTTP API
Accuracy: Excellent
My take: The tinkerer's dream. Local control, open API, reliable hardware.

5. Amazon Smart Plug — Honorable Mention (No Energy Monitoring)

I'm including this as a warning, because I see it recommended constantly: the Amazon Smart Plug does NOT have energy monitoring. It's cheap ($25, often on sale for $15), and it works fine as a basic on/off switch through Alexa. But if energy tracking is what you're after, skip it.

I've seen too many people buy these thinking they'll get power consumption data, only to discover it's just a remote switch. Check the specs before you buy.

What I Actually Monitor (And What I Found)

Here's a real snapshot from my home, measured over 30 days:

  • Chest freezer (garage): 78 kWh/month — Way too high. Turned out the door seal was worn. Replaced it, dropped to 35 kWh/month.
  • Home office setup (monitor, speakers, dock): 42 kWh/month active, 8 kWh/month standby — I now use a schedule to cut power at night.
  • TV + soundbar + streaming box: 6 kWh/month standby — Not huge, but free money when you cut it.
  • Window AC unit: 120 kWh/month — Expected during summer, but the daily breakdown helped me optimize timing.
  • Dehumidifier (basement): 55 kWh/month — Normal for the model, but I set an alert for >100W sustained draw to catch filter blockages.

Total savings from identifying waste and optimizing schedules: roughly $22/month. Every smart plug in my house paid for itself within the first billing cycle.

Setup Tips for Energy Monitoring

Enter Your Actual Electricity Rate

Most apps default to the US national average (~$0.16/kWh). Your actual rate might be very different. Check your electric bill — the rate is usually listed per kWh. Some utilities have tiered or time-of-use rates, which makes this more complicated, but even an average rate gives you useful estimates.

Monitor Before You Optimize

Don't immediately start creating schedules and automations. Plug in your devices and just watch the data for a week or two. You need a baseline before you know what to change. I was surprised by which devices were the real offenders — it wasn't always the ones I expected.

Check the Max Amperage Rating

Most smart plugs are rated for 15A (about 1,800 watts). Don't plug in space heaters, high-powered hair dryers, or anything else that draws near that limit. The plug might handle it technically, but running at max capacity generates heat and shortens the plug's lifespan.

Person checking electricity bill and energy usage on phone

Which One Should You Buy?

Here's my quick decision tree:

  • Just want the best all-arounder? → TP-Link Kasa KP125M ($17)
  • On a tight budget, need several? → Tapo P110M ($12 each, buy a 4-pack)
  • Apple household, privacy matters? → Eve Energy ($40)
  • Running Home Assistant or want local control? → Shelly Plus Plug S ($18)

If you're just starting your smart home journey, pair this with our Complete Beginner Guide to Starting a Smart Home on a Budget. Smart plugs are honestly the best first purchase — they're cheap, useful immediately, and don't require any complex setup.

And if you're tracking multiple smart devices and want to organize everything, check out how App Hacks Daily covers hidden app features that can help you get more out of the apps you're already using.

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