The Best Smart Plugs with Energy Monitoring for Home Assistant (2026)

My electricity bill went up $40 one month and I had no idea why. Turns out a dehumidifier I’d left running in the basement was pulling 700W nonstop. I would never have caught that without energy-monitoring plugs feeding data into Home Assistant’s Energy dashboard.

If you’re building out a smart home with Home Assistant, energy monitoring plugs are the single most underrated tool you’re not using. Here’s what to buy in 2026.

What Makes a Good Energy Monitoring Plug for Home Assistant?

Not all smart plugs are equal. For HA specifically, you want:

Local control — cloud-based plugs (I’m looking at you, most Wi-Fi-only units) can break integrations when companies update their APIs. Zigbee or Tasmota-flashed devices keep you local.
Accurate power readings — some plugs report wattage that’s wildly off. You want something calibrated, or at least calibratable.
Good HA integration — ideally the plug shows up with power, energy, voltage, and current entities without any workarounds.
Reliable Zigbee mesh participation — Zigbee plugs that also act as routers strengthen your mesh while doing their job.

Let me walk through what I actually recommend.

The Best Zigbee Option: SONOFF S31 Lite (Zigbee)

The SONOFF S31 Lite Zigbee (about $11-14 each, cheaper in multi-packs) is the plug I’ve deployed more than anything else. It pairs immediately with Zigbee2MQTT or ZHA, and once it’s in HA, you get a clean power entity with wattage, energy (kWh), voltage, and current.

The big deal: it’s a Zigbee router, not just an end device. Every S31 Lite you plug in extends your mesh. If you’ve got a Sonoff Zigbee Dongle or Home Assistant Connect ZBT-2 as your coordinator, a few of these plugs scattered around the house will dramatically improve range for your battery-powered sensors.

Specs:

Protocol: Zigbee 3.0
Max load: 15A
Power measurement: Yes (watt, kWh, voltage, current)
HA integration: Zigbee2MQTT / ZHA — zero config required
Price: ~$11-14/each, ~$20-25 for 2-pack

The catch: The S31 Lite is a bit beefy. It can crowd the outlet next to it on certain power strips. Not a dealbreaker, but worth knowing if you’re tight on space.

Best for: Anyone who wants to buy 4-6 plugs, scatter them around the house, and get instant Zigbee routing + power monitoring in one shot.

Best Plug-and-Play Wi-Fi Option: Kasa EP25

The Kasa EP25 (~$17-20) is what I recommend to people who don’t want to deal with Zigbee or firmware flashing. It works with the official TP-Link Kasa integration in Home Assistant, supports local polling (no cloud relay needed for basic control and power readings), and the physical design is slim — it doesn’t block adjacent outlets.

Energy monitoring is solid. You get real-time wattage and cumulative kWh. The HA integration exposes everything cleanly.

Specs:

Protocol: Wi-Fi (2.4GHz)
Max load: 15A
Power measurement: Yes (watt, kWh, voltage, current)
HA integration: TP-Link Kasa (official, local polling)
Price: ~$17-20 each

The catch: It’s Wi-Fi. That means one more device on your 2.4GHz network. If you’re already crowded (and most smart homes are), Zigbee is the smarter long-term play. Also, TP-Link has occasionally broken their local API with firmware updates — it’s been stable for a while, but it’s not the bulletproof reliability of Zigbee.

Best for: People who want simple Wi-Fi setup without worrying about Zigbee coordinators or mesh coverage.

Best for DIY / Full Local Control: Martin Jerry MK100 (Pre-Flashed Tasmota)

The Martin Jerry MK100 (~$10-14) ships pre-flashed with Tasmota and is readily available on Amazon US. From the moment you plug it in, it operates fully locally over MQTT — no cloud, no account, no firmware shenanigans required. Pair it with your Home Assistant MQTT broker and it shows up with complete power monitoring entities.

If you want to go even deeper on pre-flashed Tasmota hardware, Athom Tech sells the Athom Tasmota US Plug V2 directly — it uses the HLW8032 power metering chip and is widely regarded as one of the most accurate pre-flashed options available. It’s not on Amazon, but it ships from their store and is worth the extra step if you want best-in-class accuracy.

Specs (Martin Jerry MK100):

Protocol: Wi-Fi + Tasmota firmware (MQTT)
Max load: 15A
Power measurement: Yes (watt, kWh, voltage, current)
HA integration: MQTT / Tasmota integration — fully local
Price: ~$10-14 each

The catch: You need an MQTT broker set up in HA, which adds a bit of initial configuration. If you’re already running Mosquitto in HA, it just works. If not, it’s 10 minutes of setup the first time.

Best for: Home Assistant power users who want complete local control and maximum MQTT telemetry.

How to Use These in Home Assistant’s Energy Dashboard

The reason I love energy-monitoring plugs isn’t just knowing how much power a device uses right now — it’s feeding that data into the Home Assistant Energy dashboard.

Setup:

Go to Settings → Energy in your HA dashboard
Under “Individual Devices,” add each plug’s energy sensor
HA will track cumulative kWh per device, show cost breakdowns if you enter your electricity rate, and notify you if a device uses more than expected

I have automations that alert me when my home office UPS draws more than 300W (usually means a big backup is running) and another that tracks my chest freezer’s power draw to detect potential compressor issues before I lose $200 of food. These are the kinds of automations you only get when you have per-outlet energy data.

What About Matter Smart Plugs?

Matter smart plugs exist and are showing up more often. A few from Eve and others support Matter over Thread. But in my experience in early 2026, Matter plug support in HA is still inconsistent — some expose energy entities, some don’t. Zigbee remains more reliable and affordable until Matter’s device profiles settle down further.

My Recommended Setup for Most People

If you’re starting from zero and want energy monitoring across your home:

8x SONOFF S31 Lite Zigbee — deploy at your highest-draw devices (fridges, window AC units, dehumidifiers, TVs, office gear). These also reinforce your Zigbee mesh.
2-3x Kasa EP25 — for areas where you want simple Wi-Fi and don’t need Zigbee routing.
Enable the HA Energy dashboard — set your electricity cost per kWh, and you’ll have per-device cost tracking within a week.

Total cost for 10-12 plugs covering a whole house: $120-$180. That will probably pay for itself the first time you catch a phantom load you didn’t know about.

Beyond Plugs: Whole-Panel Monitoring with Emporia Vue 3

Smart plugs cover individual devices, but some loads — like your HVAC, electric dryer, EV charger, or hot water heater — are hardwired and can’t use a plug. For those, the Emporia Vue 3 is the recommended solution.

The Vue 3 clips CT (current transformer) clamps directly onto individual breakers inside your electrical panel, monitoring up to 16 circuits at once. It integrates with Home Assistant and gives you a complete picture of whole-home energy use alongside your per-device plug data. Think of smart plugs as the detail layer and the Vue 3 as the overview layer — together, they cover everything.

The Bottom Line

For Home Assistant users, the SONOFF S31 Lite Zigbee is the default pick — cheap, reliable, extends your Zigbee mesh, and the HA integration is rock-solid. If you want plug-and-play Wi-Fi, the Kasa EP25 is the cleanest option. And if you want maximum local control without any cloud dependencies, pre-flashed Tasmota plugs like the Martin Jerry MK100 are worth the minor setup overhead — or step up to the Athom Tasmota US Plug V2 if you want the gold standard in pre-flashed accuracy.

Stop guessing what’s running your electricity bill up. Plug in, tune in, and automate the rest.