How Much Electricity Do Smart Home Devices Use?

People ask this expecting a scary answer, and the honest one is reassuring: most smart home devices use very little electricity. A smart plug, a hub, a lock, a speaker on standby - each sips power on the order of a nightlight, not a space heater. But "very little" is not "zero," and the small draw of one device becomes a small-but-real total when a house has a couple of dozen of them running around the clock. This guide is deliberately qualitative: we will tell you which devices draw more and which draw almost nothing, but we will not invent wattage or cost figures, because the only number worth trusting is the one you measure on your own device. If you are weighing the whole cost of going smart, our how much does a smart home cost guide covers the up-front side; this one is about the ongoing electricity.

The big picture: small, not zero

Nearly all the electronics in a smart home are low-power by design. They spend most of their lives idle - waiting for a command, listening for a wake word, checking in with a hub - and idle electronics draw little. Compared with the appliances that actually move your electricity bill (heating and cooling, the water heater, the oven, the dryer), a smart plug or a video doorbell is a rounding error. So the first thing to internalize is that no realistic pile of smart-home gadgets is going to be the reason your bill is high; the furnace and the AC are.

The reason the question is worth asking at all is aggregation. One device drawing a trickle does not matter. Thirty devices each drawing a trickle, every hour of every day, add up to a modest but genuine slice of always-on load - the smart-home version of the "vampire" or standby draw that has always come from chargers and TVs left plugged in. It is small. It is also real, and it is the part you can actually see and trim if you care to. The rest of this guide is about telling the two groups apart - the sippers you can ignore and the handful worth a second look.

Plugs, hubs, locks and sensors: the true sippers

The devices that make up most of a smart home draw almost nothing. A smart plug itself uses a tiny amount of power to stay connected and listen for commands - the load that matters is whatever you plug into it, not the plug. A smart-home hub sits and coordinates other devices on a trickle. Contact sensors, motion sensors and other small sensors are so low-power they run for a long time on a battery, which tells you how little they need. A smart lock is in the same camp: it does nothing most of the day and wakes only to lock or unlock. For this whole group, the honest guidance is to stop worrying - their draw is negligible and not worth managing. If you are choosing a hub at all, our do I need a smart home hub guide helps.

Cameras and speakers: the "always doing something" group

A step up from the sippers are the devices that are genuinely always working. A wired camera streams, processes video and runs night-vision LEDs after dark, so it draws more than a plug or a sensor - still modest, but not nothing, and it runs continuously. A smart speaker or smart display is always listening for its wake word and, on a display, often keeping a screen lit, so it too has a real baseline draw. None of these is expensive to run, but they are the smart-home devices most worth being aware of simply because they never truly rest. A camera that records only on motion draws less overall than one recording 24/7, which is one more reason to think about recording mode when you set one up. Our best home security cameras roundup covers the options.

Battery devices: no mains power, but there is a catch

Battery-powered devices - a battery security camera, a battery video doorbell, a smart lock, wireless sensors - use no household electricity at all while they run, because they run off their own cells. That is a genuine advantage if minimizing your always-on mains draw is the goal. The honest catch is that the energy has to come from somewhere: you pay for it in recharging (which does use a little wall power when you top up the battery) or in replacement batteries you buy and eventually throw away. So "battery powered" means "no standby draw" but also "ongoing upkeep," and for a device like a lock that is a trade many people happily make. Our Tapo P110M review and best budget smart home devices guides are useful if you are weighing plug-in versus battery gear.

Measure it yourself with an energy-monitoring plug

Here is the practical heart of this guide, and it is why we refuse to quote you a wattage: you can measure your own. An energy-monitoring smart plug sits between a device and the outlet and reports, in its app, exactly how much power the thing plugged into it is actually drawing - live and over time. The Tapo P110M is one honest example of a plug with energy monitoring built in; there are others, and you should confirm current pricing and features on any model before buying. Put one on the device you are curious about - a lamp, an entertainment center, a mini-fridge, an always-on gadget - and after a few days the app shows you its real consumption in your home, on your electricity, with no guessing.

This turns a vague worry into a decision you can act on. If the app shows a device sipping, you stop thinking about it. If it shows a surprise - an old appliance or an entertainment center pulling more on standby than you expected - you can cut it, either by unplugging it or by putting it on a smart-plug schedule that powers it down overnight. That is the honest way to find and kill standby waste: measure, then act. It beats any number we could print, because your devices, your usage and your rates are what actually determine the bill.

Cutting the waste without babysitting

Once you can see the draw, trimming it is easy and mostly automatic. Put genuinely idle equipment - a printer, a rarely-used entertainment cluster, seasonal gear - on a smart plug and schedule it off during the hours nobody uses it, so it stops drawing standby power without you thinking about it. Leave the true sippers alone; the effort of managing a hub or a sensor is not worth the trickle you would save. And be a little skeptical of the temptation to buy energy-monitoring plugs for everything - the plug itself draws a small amount, so blanketing the house in them to chase tiny savings can be self-defeating. Meter the few devices you actually suspect, act on what you find, and move on.

It is also worth separating electricity cost from subscription cost, because people conflate them. The power a camera draws is one thing; the monthly fee some cameras charge to store footage is another, and the fee usually dwarfs the electricity. If ongoing cost is your real concern, the subscriptions are the bigger lever - our smart home subscription costs guide breaks those down, and confirming current plan pricing before you buy any device saves more than any power tweak.

The bottom line

Most smart home devices use very little electricity - plugs, hubs, locks and sensors are true sippers you can forget about, cameras and speakers draw a bit more because they are always working, and battery devices draw no mains power but ask for recharging or replacement instead. The total across a full house is small but not zero, so if you are curious or cost-conscious, the right move is not to trust a number from the internet but to put an energy-monitoring plug on the devices you suspect, see what they really draw, and schedule off the ones that waste power overnight. That gives you a real answer for your home rather than a guessed one.

The honest caveat, the same on every page here: we did not measure these devices' power draw in a lab for this guide, which is exactly why we give you qualitative guidance and point you at an energy-monitoring plug to measure your own. The descriptions above come from reading manufacturer documentation and product listings on August 1, 2026 - not from our own bench testing. Where a judgment would need hands-on time, we say so; the full method is on the methodology page.