Best Smart Plugs for Energy Monitoring (2025): Track What's Costing You

Most people have no idea which appliances are costing them the most. Smart plugs with energy monitoring solve that — they show you real-time wattage, daily kWh, and monthly cost estimates for any device.

Spoiler: the results are usually surprising. That old mini fridge in the garage? Often $15–$30/month. The gaming PC on standby? Sometimes more than when it's actually gaming.

Here's what I tested and what's worth buying.

What to Look for in an Energy-Monitoring Smart Plug

Energy monitoring precision: Most plugs claim accuracy to within 1%. Look for plugs that show wattage in real-time, not just daily kWh totals.

Max load rating: Standard plugs handle 10–15A (1,200–1,800W). For space heaters or window ACs, make sure the plug is rated accordingly.

App quality: The best monitoring is useless if the app is buggy or hard to read.

Schedule capability: The ability to set on/off schedules turns a monitoring plug into an automation tool.

Local control: Some plugs stop working if the company's servers go down or the company is acquired. Plugs with local control (Matter, Home Assistant support) are more future-proof.

Top Picks

Best Overall: Kasa EP25 Smart Plug with Energy Monitoring

Why it wins: The Kasa app shows you a clear breakdown of energy cost per day, week, and month with actual dollar estimates. The 15A rating handles most high-draw devices. TP-Link's app is consistently one of the best in the smart plug category.

Best for: Anyone who wants to start tracking energy usage without spending much.

Best for Serious Monitoring: Emporia Vue Smart Plug

Why it stands out: If you also want to monitor your whole home's energy (not just individual devices), Emporia's ecosystem lets you see both in one app. Their Vue 2 whole-home monitor pairs with these plugs for a comprehensive picture.

Best for: Data nerds who want granular tracking across many devices.

Best Budget Pick: Gosund Smart Plug Mini

Why it's worth considering: The mini form factor is genuinely useful — most plugs block the second outlet, these don't. At $7.50 each in a 4-pack, the price is hard to argue with for basic monitoring.

Best for: Renters or those who want to monitor many devices without spending much.

Best for Apple HomeKit: Eve Energy Smart Plug

Why it's different: Eve uses Apple's HomeKit and Thread protocol — it works entirely locally, with no Eve cloud servers involved. Your energy data stays on your devices. If you're all-in on Apple, this is the most reliable and private option.

Best for: Apple HomeKit users who want privacy and reliability over features.

Best Heavy Duty: DEWENWILS Outdoor Smart Plug

Best for: Outdoor Christmas lights, pool equipment (light low-draw), garden fountains, patio heaters.

What I Found When I Monitored Everything

After plugging energy monitors into every major device in my home for a month, here were the surprises:

| Device | Assumed Monthly Cost | Actual Monthly Cost | |--------|---------------------|-------------------| | Old mini fridge (garage) | ~$5 | $22.40 | | Gaming PC (standby) | ~$2 | $8.10 | | Cable box + DVR | ~$3 | $11.20 | | Fish tank heater + filter | ~$4 | $7.80 | | Home theater receiver (standby) | ~$1 | $6.30 |

The cable box finding is common — DVRs run 24/7 recording content you never watch. Unplugging it when not in use saved $130/year.

Smart Plugs vs. Whole-Home Energy Monitors

Smart plugs are per-device. If you want to monitor your whole home at once, consider a whole-home energy monitor:

For most people, start with 2–3 smart plugs on your highest-suspected devices. Once you've identified your energy hogs, you can decide whether to go deeper.

Schedule + Monitor = Maximum Savings

The real power of energy-monitoring smart plugs is combining data with automation:

1. Monitor a device for 2–4 weeks to understand its usage pattern
2. Set a schedule to turn it off during peak hours or overnight
3. Track the before/after savings in the app

Example: My home theater receiver drew 45W in standby 24/7 ($47/year). I set the plug to cut power at midnight and restore at 8 AM. Net savings: $28/year. That plug paid for itself in 7 months.

Quick Comparison

| Model | Price | Max Load | App Quality | Voice Control | Local Control | |-------|-------|---------|------------|--------------|---------------| | Kasa EP25 | $17 | 15A | Excellent | Yes | Partial | | Emporia 4-pack | $60 | 15A | Good | Yes | No | | Gosund 4-pack | $30 | 10A | Fair | Yes | No | | Eve Energy | $40 | 10A | Excellent | HomeKit | Yes | | DEWENWILS Outdoor | $23 | 15A | Good | Yes | No |

My recommendation: Start with the Kasa EP25 for 1–3 devices. If you want to go deeper into whole-home monitoring, the Emporia ecosystem is the best integrated option.