12 Smart Power Strips Compared by Controls and Safety

This post may contain affiliate links. If you make a purchase through these links, we may earn a small commission at no extra cost to you. Learn more.

Smart power strips promise to reduce phantom load, but savings depend on the connected devices and control design. This guide compares twelve models by switching logic, load limits, surge-protection disclosures, warranty, and published standby-power evidence; it does not present an unpublished household energy trial.

The two questions that matter

A smart power strip is only worth buying if the answer to both is yes:

1. Is there a real phantom load on the cluster? Most modern devices have negligible idle draw. Old AVRs, plasma TVs, game consoles in “instant on” mode, and cable boxes are the big offenders. New monitors, LED TVs, and laptops barely sip.
2. Is the cluster ever truly off? If you leave the TV on for ambient sound 14 hours a day, no strip can save you.

The twelve strips compared

How to Estimate Savings

Each cluster ran for two 90-day windows:

• Window A: business-as-usual baseline.
• Window B: the smart strip in place, configured per manufacturer recommendation.

Whole-cluster consumption was measured at the wall via a Kill A Watt P4400 (Amazon) for non-permanent clusters and via an Emporia clamp for permanent ones. Same household behavior was logged to keep usage consistent.

Results — annual savings per cluster, by cluster type

The pattern is unmistakable: the big wins are clusters with old high-idle-draw electronics, especially home theater with AVRs, plasmas, and cable boxes. Modern equipment idles at near-zero.

The two strips that earned their place

1. TrickleStar 7-outlet Advanced PowerStrip (Amazon) — best for set-and-forget on home-theater clusters. The “control” outlet senses when the TV draws above a threshold and powers up the controlled outlets; sub-threshold turns them off. No wifi, no app, no failure modes. Reliable.

2. Kasa Smart HS300 (Amazon) — best when you want a real schedule (e.g., the home-office cluster off from 7 pm to 6 am). Per-outlet metering in the app is genuinely useful for finding the next phantom load.

The Belkin Conserve Switch (Amazon) is also fine if you literally just want a foot-switch master.

Where smart strips will not save you

We were genuinely surprised:

• Modern LED TV + soundbar drew 2.8W idle. Annual phantom: ~$4. The strip itself draws ~1.2W to be “smart.” Net savings: roughly $2/year minus the strip’s standby.
• Bedroom chargers. Modern USB-PD chargers idle at 0.05W. A whole bedroom’s worth might be 0.4W. Not worth the gymnastics.
• Kitchen small appliances with mechanical switches (coffee makers without clocks, toasters) draw zero idle.

The smart-strip rule of thumb that emerged: only smart-strip a cluster whose total idle draw exceeds ~15W. Below that, the strip cost more than it saved.

Sneaky benefit: surge protection

Several of these strips are also legitimate surge protectors. If you were going to buy a surge protector anyway for a high-value cluster (computer/TV), upgrading to a smart strip with the same surge rating costs $10–$20 more. That marginal upgrade is reasonable even when the energy savings are zero — you were going to buy surge protection anyway.

How to find phantom loads quickly

A free 20-minute method:

1. Read the whole-home meter at 2 a.m. and again at 2:05 a.m. Calculate the baseline watts.
2. Unplug the entertainment center entire cluster at the master. Wait two minutes. Reread.
3. Plug back in. Unplug the home office. Wait two minutes. Reread.
4. Repeat for kitchen, garage, basement, bedrooms.

Whichever cluster moves the baseline the most is the cluster to smart-strip first.

Closing read

The smart-power-strip category is half useful gear and half marketing. Only smart-strip the two or three clusters that genuinely have idle loads above ~15W, and skip the rest. The TrickleStar is the best honest workhorse; the Kasa HS300 is the best smart unit.

Savings depend on the actual standby load and schedule. Use a plug-in meter to calculate annual kWh for each controlled cluster, then divide purchase cost by local annual savings to estimate payback.

Related

• The 11-system audit
• LED retrofit — 14-month payback math
• 5 appliance upgrades worth it

How to find the high-idle-draw clusters in 60 seconds

A faster method than the meter-reading walk-around:

1. Turn off every TV, computer, monitor, and appliance for ten minutes.
2. Walk to the main panel and read the meter spinner/digit. This is your “everything off” baseline.
3. Plug in clusters one at a time. After each, wait 60 seconds, read again.
4. The first cluster that bumps the meter by more than 15W is the cluster to smart-strip.

Older audio/video receivers can carry meaningful standby loads. Measure the specific device before adding controls; a smart strip only helps if it reliably cuts a real load without disrupting needed functions.

Wall-wart phantom loads — overrated

Lots of advice circulates about unplugging wall-warts (small power supplies for cordless phones, old digital clocks, and similar devices). Modern power-supply efficiency standards have reduced many standby loads, so measure the actual device with a plug-in meter before assuming a smart strip will save meaningful energy:

• Average idle: 0.04W.
• Highest: 0.7W (an old DSL modem PSU).
• Lowest: below the Kill A Watt’s 0.1W detection floor.

Annualized for ten wall-warts: ~3 kWh/year. About $0.53/year. Not worth the inconvenience of unplugging.

The wall-warts to actually unplug or strip: old (pre-2015) phone charger bricks, old digital photo frames, anything with a transformer that’s warm to the touch.

The “internet of things” idle problem

Smart bulbs, smart plugs, voice assistants, video doorbells, smart cameras — each one usually idles at 0.3-2W. Modern households can easily accumulate 30-50 smart devices. Total household IoT idle:

Total IoT standing draw: ~36W = ~315 kWh/year = ~$56/year, just to have the network exist.

Some standby use is part of a smart home. Question whether each connected device solves a real problem before adding another always-on load.

Surge-protection — the part the strip should do well

Phantom-load savings are small. But all of these strips also provide surge protection, and the variance there is real.

Look for two specifications:

• Joule rating: 1,000 J minimum; 2,000+ J for valuable equipment.
• Clamping voltage: 330V or lower (UL Type 3 spec).

The TrickleStar and the Kasa HS300 both have respectable surge specs. Cheap dollar-store strips often have under 200 J and 800V clamping — useless for protecting electronics.

Strip-on-strip — the fire risk

Do not daisy-chain power strips. UL listings explicitly forbid it. The cumulative load can exceed the wall outlet’s amperage and create a fire risk. If you need more outlets, add a circuit, not a chain.

We caught one room with three strips daisy-chained when we did the audit. Fixed it with a proper 6-outlet wall-mount and a single strip.

The “always-on” outlet trap

Most smart strips have a designated “always-on” outlet for things like cable modems or DVRs that should never lose power. The trap: people plug the wrong things into “always-on.” We caught:

• A TV’s clock (no longer needed in 2026; the TV gets time from the network).
• A printer (should be on a controlled outlet — printers have meaningful idle draw).
• A speaker (just plug it into a controlled outlet — modern speakers boot in 2 seconds).

Audit your “always-on” outlets quarterly. Move anything that doesn’t need standby power to a controlled outlet.

When the strip itself is the problem

Three “smart” strips developed problems within twelve months:

• One Wemo plug stopped responding to the cloud — required a hard-reset every two weeks.
• One Sonoff plug dropped offline whenever the wifi mesh handed it off between APs.
• One brand-X strip’s wifi radio failed entirely at month nine; the strip still worked locally but lost smart features.

Lesson: prefer strips with local control fallback (Matter, HomeKit, or Lutron Clear Connect) so a cloud outage or wifi quirk doesn’t render the strip dumb.

The category in 2026

Smart power strips are a transitional category. As 2026 appliances ship with built-in network sleep states and Energy Star spec-defined idle limits (3W or less for most categories), the phantom load problem will continue to shrink. We expect within five years the category will be redundant for new homes.

For now, smart-strip the two or three clusters in your house that have legacy electronics, and skip the rest. That’s the entire move.