The Real Cost of Running Smart Home Devices All Year

Smart home devices are always on, always listening, always connected. Each one draws a small amount of power continuously — and in a home with dozens of smart devices, those small draws add up. We measured the actual power consumption of common smart home devices to calculate the real annual electricity cost.

How We Measured

We used a Kill A Watt electricity monitor to measure actual power draw at the outlet over 7-day periods, capturing both idle and active states. We calculated annual costs using the US average electricity rate of $0.16 per kWh.

The Results: Device-by-Device Annual Cost

Smart Speakers and Displays

| Device | Idle Power | Active Power | Annual Cost | |--------|-----------|-------------|-------------| | Amazon Echo Dot (5th Gen) | 1.8W | 8W | $2.80 | | Amazon Echo (4th Gen) | 2.5W | 15W | $4.20 | | Amazon Echo Show 10 | 4W | 22W | $8.50 | | Google Nest Mini | 1.5W | 7W | $2.40 | | Google Nest Hub Max | 5W | 25W | $10.00 | | Apple HomePod Mini | 1.5W | 10W | $3.00 | | Apple HomePod (2nd Gen) | 3W | 18W | $5.50 |

Smart speakers are surprisingly efficient in idle mode. Even with 5 in a home, you are paying about $15-20/year total.

Security Cameras

| Device | Idle Power | Active Power | Annual Cost | |--------|-----------|-------------|-------------| | Ring Indoor Cam (wired) | 3W | 5W | $4.50 | | Ring Floodlight Cam (wired) | 4W | 28W (lights on) | $10-25 | | Wyze Cam v3 | 3.5W | 5W | $4.50 | | Reolink 4K PoE | 8W | 12W | $12.00 | | Arlo Pro 4 (with hub) | Hub: 5W | Camera: battery | $7.00 (hub) |

Security cameras run 24/7 and are among the highest consumers. A 4-camera wired system draws 20-45W constantly, costing $28-60/year in electricity.

Networking Equipment

| Device | Power Draw | Annual Cost | |--------|-----------|-------------| | ISP modem | 8-12W | $11-17 | | Basic Wi-Fi router | 6-10W | $8-14 | | Mesh system (3-node) | 18-30W | $25-42 | | Network switch (8-port) | 4-8W | $6-11 | | NAS (2-bay, idle) | 15-25W | $21-35 | | NAS (2-bay, active) | 25-40W | $35-56 |

Networking equipment is the second-largest always-on power consumer in most homes. A full networking setup (modem + mesh + switch + NAS) easily draws 45-75W continuously, costing $63-105/year.

Smart Lighting

| Device | Standby Power | Active Power | Annual Cost | |--------|-------------|-------------|-------------| | Smart LED bulb (off, standby) | 0.3-0.5W | 8-12W (on) | $1-2 per bulb | | Philips Hue Bridge | 3W | 3W | $4.20 | | Smart light switch | 0.5-1W | 0.5-1W | $0.70-1.40 | | Smart plug | 0.5-1W | 0.5-1W + load | $0.70-1.40 |

Smart bulbs in standby mode (off but connected to Wi-Fi) are remarkably efficient. Ten smart bulbs in standby cost about $4-7/year. The Hue Bridge costs more than any individual bulb.

Robot Vacuums

| Device | Charging/Idle | Cleaning | Annual Cost | |--------|-------------|----------|-------------| | Roomba j7+ (on dock) | 4-6W | 30-45W | $8-12 | | Roborock S8 Pro Ultra (dock) | 8-12W | 30-50W | $14-20 | | Self-emptying dock | +5-15W during empty cycle | — | Included above |

Robot vacuum docks draw power continuously for trickle charging and maintaining the self-emptying/washing systems. The premium all-in-one docks with water tanks and mop washing draw more.

Smart Thermostats

| Device | Power Draw | Annual Cost | |--------|-----------|-------------| | Nest Learning Thermostat | 0.5W | $0.70 | | Ecobee Premium | 1W | $1.40 |

Thermostats use almost no power because they are typically powered by the HVAC system's 24V C-wire. The power they consume is trivial — but they can save $100-200/year in HVAC efficiency, making them the only smart home device with a positive ROI.

The Total: A Typical Smart Home

Here is the annual electricity cost of a realistic smart home setup:

| Category | Devices | Annual Cost | |----------|---------|-------------| | Smart speakers (4) | Various | $13 | | Security cameras (3 wired) | Ring/Wyze | $14 | | Video doorbell (1) | Ring | $5 | | Networking (modem + mesh) | Various | $36 | | NAS (1 unit) | Synology | $30 | | Smart bulbs (10 + bridge) | Hue | $15 | | Smart plugs (5) | Various | $5 | | Robot vacuum (1) | Roomba | $10 | | Smart thermostat (1) | Nest | $1 | | Smart TV (standby) | LG | $8 | | Game console (standby) | PS5 | $10 | | Total | ~30 devices | $147/year |

That is roughly $12/month in electricity for an entire smart home ecosystem — less than a single streaming subscription. Not catastrophic, but not negligible either.

How to Reduce Smart Home Power Costs

1. Use smart plugs to hard-cut power to devices you do not use continuously — A TV that draws 8W in standby can be cut to 0W when not in use
2. Choose battery-powered cameras where possible — they use zero standby power (at the cost of recharging convenience)
3. Consolidate smart speakers — You probably do not need one in every room
4. Enable sleep mode on your NAS — Most NAS devices can spin down drives and reduce power to 5-8W when idle
5. Check your mesh system — Some mesh nodes can be turned off when you are not in that area

The Bigger Picture

The $147/year electricity cost is real, but it is also relatively small compared to the utility these devices provide — automated lighting, home security, entertainment, climate control, and convenience. The smart thermostat alone may save more in HVAC efficiency than the entire smart home costs in electricity.

The takeaway: smart home power costs are not a reason to avoid smart devices, but they are a cost that honest product reviews should mention. Now you know the real numbers.

Read our smart home buying guide →

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