⚡ Quick Answer
The TP-Link Kasa EP25 is the best energy-monitoring smart plug for most users because it combines Matter support, reliable real-time energy monitoring (watts, amps, volts, kWh), a compact profile that doesn't block adjacent outlets, and a sub-$20 street price. It works with Alexa, Google Home, Apple Home, and Home Assistant — all without a hub.
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TP-Link Kasa EP25 — Matter Smart Plug with Energy Monitoring
Matter-certified smart plug with real-time energy monitoring. Works with Alexa, Google Home, Apple Home, and Home Assistant. No hub required.
Check Price on AmazonWhat Is the TP-Link Kasa EP25?
The TP-Link Kasa EP25 is a Wi-Fi smart plug with built-in energy monitoring and Matter certification. Released in 2023, it represents TP-Link's move to the Matter smart home standard — meaning it works natively with any Matter-compatible hub or voice assistant without requiring the Kasa app for initial setup.
At roughly $18–$20 per plug (or $14–$16 in multi-packs), it sits in the sweet spot between basic smart plugs (no energy monitoring, ~$10) and premium options (Shelly Plug Plus S at ~$25). The EP25 packs real-time wattage monitoring, voltage, current, and cumulative kWh tracking — all useful data for identifying power hogs, automating based on appliance state, and monitoring energy bills.
What Are the Key Specs?
| Spec | Value |
|---|---|
| Max load | 15A / 1875W |
| Protocol | Matter over Wi-Fi (802.11b/g/n, 2.4 GHz) |
| Energy monitoring | Watts, amps, volts, kWh (cumulative) |
| Voice assistant support | Alexa, Google Home, Apple HomeKit (Matter) |
| App required for setup | Kasa app or Matter controller |
| Physical button | Yes (manual on/off override) |
| Form factor | Single plug, compact rectangular |
| Dimensions | 74 × 43 × 32 mm |
| Price | ~$18–$20 single / ~$14–$16 in 4-pack |
What Does Matter Support Mean for You?
Matter is the smart home interoperability standard developed by Apple, Google, Amazon, and Samsung. A Matter-certified device like the EP25 can pair directly with any Matter controller — including Apple Home (requires HomePod mini or Apple TV 4K), Google Home, Amazon Echo (4th gen), or Home Assistant — without going through Kasa's servers or app (after initial Matter commissioning).
In practice, this means:
- Switch from Alexa to Apple Home without re-pairing the plug
- Control locally from multiple ecosystems simultaneously
- No dependence on Kasa cloud servers for control
- Future-proof compatibility as Matter becomes universal
One important note: Matter as of mid-2025 supports on/off control of the EP25 but does not expose energy monitoring data to Matter controllers. For energy monitoring data in Home Assistant, you still need the Kasa integration (which uses the local TP-Link KLAP protocol) rather than the Matter integration. Both can coexist.
What Energy Monitoring Data Does It Provide?
The EP25 provides the following real-time and historical data:
- Real-time power (W): Live wattage draw, updated every 2–5 seconds
- Voltage (V): Live voltage reading
- Current (A): Live amperage
- Daily energy (kWh): Consumption for the current day
- Monthly energy (kWh): 30-day rolling total
- Runtime: Total time the connected device has been powered
The Kasa app presents 7-day and 30-day energy history graphs and gives a monthly cost estimate if you enter your electricity rate. Accuracy is within ±2% of a calibrated Kill A Watt meter — good enough for identifying energy hogs and tracking consumption trends.
A key use case: plug in your refrigerator, washing machine, or dehumidifier. The power draw fluctuates predictably with the appliance's operating cycle. In Home Assistant, you can trigger automations based on these draw patterns — for example, sending a notification when the washing machine's wattage drops from ~300W (running) to ~5W (standby), signalling the cycle is done.
How Does It Work with Home Assistant?
The EP25 integrates with Home Assistant via the official Kasa integration, which uses the local TP-Link KLAP protocol (no cloud required once configured). Auto-discovery finds the plug on your network, and you get:
- Switch entity (on/off)
- Power sensor (W) — real-time
- Energy sensor (kWh) — cumulative, compatible with HA Energy Dashboard
- Voltage and current sensors
- Signal strength (RSSI)
Update frequency via the local Kasa integration is approximately every 30 seconds by default, configurable to 5–10 seconds for near-real-time monitoring. For HA's Energy Dashboard, the cumulative kWh sensor slots in directly — tracking the appliance's energy consumption over days, weeks, and months.
Is the Design Good?
The EP25 has a compact rectangular profile that's noticeably slimmer than older Kasa plugs. It extends about 32mm from the wall — shallow enough not to obstruct furniture placement. Critically, it doesn't block an adjacent outlet on a standard US duplex socket, making it practical in tight spaces.
The physical button on the front glows a soft LED (blue = on, off = standby) that's visible but not blinding at night. The button provides manual override regardless of Wi-Fi status — the plug remembers its last state and reconnects automatically after a Wi-Fi outage.
EP25 vs Kasa EP15 vs Shelly Plug Plus S
| Feature | Kasa EP25 | Kasa EP15 | Shelly Plug Plus S |
|---|---|---|---|
| Price | ~$18 | ~$15 | ~$25 |
| Energy monitoring | Yes | No | Yes |
| Matter support | Yes | No | No |
| Local API | Yes (KLAP) | Yes | Yes (REST/MQTT) |
| Max load | 15A/1875W | 15A/1875W | 16A/3680W |
| HA integration | Official | Official | Official |
| Form factor | Compact | Compact | Round/bulky |
The EP25 beats the EP15 by adding energy monitoring for just $3 more — an easy upgrade. Against the Shelly Plug Plus S, the EP25 wins on price and Matter support; the Shelly wins on maximum load (16A vs 15A) and slightly better MQTT API depth for power users.
Our Verdict
The TP-Link Kasa EP25 is the best energy-monitoring smart plug for most users in 2025. Matter certification, local API access via the official Home Assistant Kasa integration, a compact form factor that doesn't hog adjacent outlets, and a sub-$20 price combine to make it the obvious choice for anyone who wants smart plug energy monitoring without complexity. The only limitation is that Matter doesn't yet expose energy data — but the local Kasa integration fills that gap perfectly.
Score: 8.5/10
Buy on AmazonFAQ
Does the Kasa EP25 work without the Kasa app?
After initial Matter commissioning (which requires the Kasa app once), you can control the EP25 through any Matter controller — including Home Assistant — without the Kasa app. For energy monitoring data, the Kasa integration (local API) is still needed.
Does it work with Home Assistant?
Yes, via the official Kasa integration using the local KLAP protocol. It auto-discovers on your network and exposes switch, power, energy, voltage, and current entities with no cloud dependency.
Does Matter expose energy monitoring data?
Not yet (as of mid-2025). Matter's plug specification supports on/off and occupancy sensing but not energy monitoring data. Use the local Kasa integration in Home Assistant to access power/energy sensors.
What's the maximum load for the EP25?
15A / 1875W — suitable for most household appliances. Do not use with high-draw devices like electric heaters (>1500W continuous), EV chargers, or air conditioners without checking the appliance's peak load.
Does the EP25 work with Apple HomeKit?
Yes, via Matter. You need a Matter controller (HomePod mini, Apple TV 4K gen 3, or iPad) to add it to Apple Home. Energy monitoring data is not exposed in Apple Home — use the Kasa app or Home Assistant for power readings.
Is the EP25 compatible with the HA Energy Dashboard?
Yes. The cumulative kWh sensor exposed by the Kasa integration adds directly to Home Assistant's Energy Dashboard for per-device energy tracking.
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