Does Unplugging Appliances Save Electricity? Mostly Not the Ones You Unplug

Short answer: yes, but almost certainly not from the things you were told to unplug. The most thorough measurement of this, covering 70,000 homes, found that always-on devices consumed around 23% of household electricity, averaging 164 watts of continuous draw and costing roughly $165 a year at national average rates. Phone chargers were a rounding error inside that. The load sits in five or six devices you have probably never considered unplugging, and two of them cannot be unplugged at all.

The advice everyone repeats is not wrong about the problem. It is wrong about the location.

What was measured, and how

The Natural Resources Defense Council analysed smart meter data from 70,000 homes in northern California, added demographic detail from 2,750 of them, and did full device-by-device audits in 10. That combination is what makes the result usable: the meter data gives scale, the audits explain what the meter was seeing.

A quarter of a household's electricity going to devices doing nothing is a genuinely large finding, and it is the reason this advice exists at all. The problem is what happened to the finding on its way to becoming a listicle.

Where the load actually is

Here are the measured idle draws from the audited homes, ranked. The unit is watts of continuous draw, which is the number that matters: a device pulling 1 watt continuously costs about $1.10 a year at $0.125/kWh, so you can read the right-hand column directly.

That last row is the point of the article. Unplugging your phone charger every night for a year saves you somewhere around twenty-five cents. It is not that the advice is marginal. It is that it is off by a factor of roughly two hundred from the top of the list.

Consumer electronics account for 51% of idle load, miscellaneous electrical loads for 34%, and traditional large uses — heating, cooling, lighting and refrigeration combined — for just 15%.

Delforge, Schmidt and Schmidt, NRDC Home Idle Load, 2015

Why the big items are big

Set-top boxes and cable DVRs barely have an off state. Many draw close to their operating power while "off", because they are still recording, updating guides and maintaining a network connection. This is the single worst device category in most homes and it is the one nobody unplugs, because unplugging it means waiting several minutes for it to boot and re-sync.

Game consoles in instant-on mode are the modern equivalent. The setting that lets the console wake in two seconds keeps it drawing tens of watts continuously. Turning instant-on off is a menu item, costs you a slower boot, and is one of the highest-value single changes available.

Networking gear runs at full draw permanently and should. Your router and modem together are perhaps $25 a year. Unplugging them nightly saves a fraction of that and breaks everything else in the house that expects a network. This is a bad trade and we are not going to recommend it.

The furnace, the alarm and the GFCI outlets cannot be unplugged. Roughly 15 watts of your 164 is infrastructure. Accept it.

The five changes actually worth making

1. Turn off instant-on / quick-start on games consoles and TVs. Menu setting, permanent, saves the most of anything on this list. Do this one first.

2. Put the television, amplifier, console and set-top box on one switched power strip. One switch at night handles the entire entertainment cluster, which is where the majority of the recoverable load lives. If the set-top box is a rented DVR that must stay on, leave it out of the strip rather than abandoning the idea.

3. Sleep the desktop, or replace it. A desktop idling at 49 W costs more than everything else in this article combined. Sleep settings fix most of it. If the machine is old, the gap between an idling 2014 desktop and a modern laptop is enormous.

4. Audit the forgotten loads. The NRDC audits found the strangest results here: aquarium equipment at 9–67 W, hot water recirculation pumps at 28–92 W, decorative or 24/7 lighting at up to 104 W, heated towel rails at 140 W. If you have any of these, one of them is probably your largest single idle load, and a $20 plug-in power meter will find it in an afternoon.

5. Stop unplugging chargers. Not because it does harm, but because it costs you a small amount of attention every day in exchange for nothing, and that attention is better spent on item 1. Doing the useless version of a good habit is worse than not having the habit, because it feels like the job is done.

How to find your own, in one afternoon

The averages above are useful for ranking. They are not your house, and the NRDC audits found enormous variation between homes with similar occupancy. The measurement is easy enough that guessing is not worth it.

The whole-house method. Turn off everything you would normally turn off at night, then read your meter. A modern smart meter shows current draw directly; an older one, count the disc revolutions or the pulse LED against the constant printed on the faceplate. Whatever it reads is your idle load. Compare it with the 164 W average. If you are well above, something specific is causing it and the next step will find it.

The plug meter method. A plug-in energy monitor costs about the price of a takeaway and reads watts directly. Work through the suspects in the order of the table above, giving each device two minutes in its idle state. Write the numbers down; you only have to do this once.

The bisection method, if the whole-house figure is high and you cannot find the cause. Turn off circuits at the consumer unit one at a time and watch the meter. Ten minutes, and it localises the load to a room.

The smart plug paradox, and other traps

Smart plugs draw standby power themselves, typically 0.5 to 2 watts each. Putting a smart plug on a device that idles at 1 watt is a net loss, and buying eight of them to automate a problem that a $5 switched strip solves is a worse one. Use them where the controlled load is large and the schedule genuinely varies.

"Eco" and "energy saving" modes are not off. They reduce idle draw, often substantially, and the device is still drawing. Worth enabling, not worth counting as solved.

Unplugging a fridge, freezer or anything with a compressor is not an energy strategy. Nor is switching off a router that a security camera, doorbell or heating control depends on. The cost of the thing that stops working exceeds the saving every time.

Regulation has already done part of the work. Standby limits under the EU Ecodesign rules and the US Energy Star programme have pushed most new consumer electronics toward roughly 0.5 W in true standby. This is why the phone charger figure is now trivially small, and why the expensive loads are concentrated in devices that are not really in standby at all — the DVR that is still recording, the console that is still listening. The rule of thumb that follows: if it does something while it is off, it costs real money; if it genuinely does nothing, it costs almost none.

What this is worth

If your household is near the average, the recoverable portion of that $165 is realistically $60 to $100 a year: the entertainment cluster, the desktop, the instant-on settings and whichever forgotten load turns out to be yours. It is not life-changing money. It is roughly one streaming subscription, obtained by flipping one switch at night and changing two settings once.

Which is a better return than most of what gets filed under saving money, and it stacks with the exercise in finding the subscriptions you forgot you were paying for.

Electricity rates vary widely by region and tariff. The annual figures here use the $0.125/kWh national average rate applied in the source report; check your own rate before deciding what is worth changing.