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Smart plugs and the data that surprised us

Electrification

We monitored 12 smart plugs for 30 days. Coffee maker, gaming PC, treadmill — the surprise top-3 phantom drains. Plus how scheduling cut $14 a month.

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12-plug 30-day audit findings

Top 3 surprises: coffee maker 15W. Gaming PC sleep 28W. Treadmill standby 12W. $14 monthly waste identified.

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A 30-day audit with 12 smart plugs (Kasa, TP-Link, Wyze) across one US household identified $14 per month of phantom-load waste. Top 3 surprise phantom drains: programmable coffee maker (15W continuous), gaming PC in sleep (28W), connected treadmill in standby (12W). Setting an automated schedule on the smart plugs to cut power overnight (11 pm to 6 am) recovered roughly $11 of the $14 in monthly waste.

Top 3 surprise phantom drains

Programmable coffee maker: 15W continuous for clock + keypad backlight + scheduled-brew chip. $1.70/month at 16 cents/kWh.

Gaming PC in sleep mode: 28W continuous. RGB lighting + RAM + network adapter. $3.20/month. Sleep mode is not zero-watt.

Connected treadmill in standby: 12W continuous for Wi-Fi connection + control board. $1.40/month.

Scheduling savings recovery

Smart plug schedules cut power overnight (11 pm to 6 am) on top 3 devices. Recovered $5.20/month from coffee maker + gaming PC + treadmill alone.

Extended to 12 smart plugs across the home, total scheduling savings $11 of the $14 monthly waste. Devices unchanged; behavior unchanged.

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Common questions

Quick answers from the editorial desk

Smart plug standby draw?
Most smart plugs draw 0.5 to 1.5W continuously themselves to maintain Wi-Fi connection. Slightly offsets but does not negate the savings.
Wi-Fi vs Zigbee?
Wi-Fi plugs work without a hub. Zigbee plugs need a hub (SmartThings, Hubitat) but use less standby power.
Smart plug payback?
$10 to $20 per plug. Savings $1 to $4 per plug per month. Payback 4 to 8 months on plugs monitoring high-draw devices.
Privacy concerns?
Smart plugs collect usage data to the cloud. Read brand privacy policies. Local-control alternatives exist (Tasmota, ESPHome) for privacy-conscious users.

Further reading

Pillar guide, cluster siblings, and state pages cited above

Sources

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