Standby power drain is the electricity your devices keep pulling while they seem to be off or sitting in standby. Think of the little red light on your TV, the clock on your microwave, or a charger with no phone attached. For an average home it adds up to roughly 450 kWh a year. At an electricity price of 0.30 to 0.35 euro per kWh, that costs you around 135 to 160 euro a year, and in a fully kitted-out home with lots of gadgets it climbs to several hundred euro. The good news: you can avoid roughly three quarters of it. In this guide you’ll read exactly how to track down the hidden drainers and deal with them.
What is standby power drain, exactly?
Standby power drain (also called phantom load or vampire power) is electricity that devices use without doing anything useful for you.
It happens in three situations:
- Standby. The device is waiting for a signal from the remote or an app. The TV, soundbar, and set-top box are the classics here.
- Seemingly off. You’ve pressed the power button, but the power supply stays live. A clock or light that keeps glowing is the proof.
- Empty but plugged in. A charger or adapter with no device attached still pulls a tiny bit of power.
The crux is the cumulative effect. One device drawing a few watts looks like nothing. But ten to twenty of those, 24 hours a day, 365 days a year, really do add up to a hefty sum.
How much does standby power drain cost per year?
A useful benchmark is roughly 450 kWh a year for an average home. What that means in euros depends on your electricity price.
| Electricity price | Cost at 450 kWh of standby drain |
|---|---|
| 0.25 euro/kWh | around 115 euro |
| 0.30 euro/kWh | around 135 euro |
| 0.35 euro/kWh | around 158 euro |
Handy rule of thumb: 1 watt running non-stop costs you roughly 8.76 kWh a year. At 0.30 to 0.35 euro per kWh that’s about 2.60 to 3.10 euro a year. Per watt. Do the maths: a set-top box pulling 12 watts costs you roughly 30 to 37 euro a year while your TV is off.
The biggest power drainers in the home
Not every light is equally guilty. The real culprits are devices that draw a lot of watts and stay live 24 hours a day. The table below assumes continuous standby draw and an electricity price of 0.30 to 0.35 euro per kWh.
| Device | Standby power | Use per year | Cost per year |
|---|---|---|---|
| Set-top box / TV decoder | 8-15 watts | 70-130 kWh | 21-46 euro |
| Wi-Fi router + modem | 5-12 watts | 44-105 kWh | 13-37 euro |
| Games console (rest mode / instant-on) | 1-15 watts | 9-130 kWh | 3-46 euro |
| Desktop PC with peripherals (sleep) | 2-10 watts | 18-88 kWh | 5-31 euro |
| Boiling-water tap (e.g. Quooker) | around 10 watts | around 88 kWh | 26-31 euro |
| Small electric water heater / undersink | around 17 watts | around 150 kWh | 45-53 euro |
| Printer (standby) | 3-10 watts | 26-88 kWh | 8-31 euro |
| Microwave with clock display | 2-5 watts | 18-44 kWh | 5-15 euro |
| Espresso machine / coffee maker | 2-5 watts | 18-44 kWh | 5-15 euro |
| Soundbar / media player | 1-5 watts | 9-44 kWh | 3-15 euro |
| Washing machine / dishwasher (standby) | 1-3 watts | 9-26 kWh | 3-9 euro |
| TV (modern, true standby) | 0.5-1 watt | 4-9 kWh | 1-3 euro |
| Charger (empty, each) | 0.1-0.5 watt | 1-4 kWh | 0.30-1.40 euro |
What stands out: the TV itself does surprisingly well thanks to stricter EU rules (often under 1 watt in standby), but the kit around it doesn’t. A TV decoder can burn through 30 to 130 kWh a year. So the peripherals are the real vampire, not the screen.
Note: these are ballpark figures. Brand, model, and settings make a huge difference. A games console in “energy-saving sleep” pulls very little, but in “instant-on” or during overnight downloads it draws many times that. The only way to know for sure what your device is doing is to measure it.
How do you track down standby power drain?
There are four practical methods, from free to a small investment.
1. Read your smart meter or P1 port at night
In the middle of the night, switch off everything you deliberately use. Then look at your smart meter, or at the app that reads out your P1 port.
Whatever is left as live power draw (in watts) is roughly your total baseline: fridge, freezer, router, heating pump, and all the hidden drainers together. Subtract the devices that genuinely have to stay on, and you’ll know roughly how big your hidden load is.
This is the fastest way to see whether you even have a problem, and it’s free.
2. A plug-in power meter (wattmeter) between socket and device
A simple power meter often costs just 10 to 15 euro. You plug it into the socket and plug the device back into the meter.
For a reliable figure, measure a device in standby for a whole night. Divide the measured use by the number of hours you measured, and you have the average power draw. Multiply that by the number of standby hours per year and your electricity price, and you’ll know exactly what it costs you.
This is the most accurate method for catching the culprit device by device.
3. Smart plugs with energy monitoring
A smart plug with built-in monitoring does the same thing as a power meter, but logs continuously in an app. Handy if you want to track a device over a longer period or switch it off remotely.
It is a bit pricier than a bare power meter, and the plug itself also uses a fraction.
4. The everything-off test
When you head out for a few hours, systematically switch off groups of devices and check your meter each time to see what changes. That way you can isolate, room by room or power strip by power strip, where the load sits, without needing a meter everywhere.
How do you tackle standby power drain?
Tracking it down is step one. Now you switch the saving on.
Truly switch devices off with a switched power strip. Group your TV, soundbar, games console, and set-top box onto one power strip with a switch. One click and the whole cluster is completely dead. This is the cheapest and most effective measure, and it often deals with the priciest drainers in one go.
Use a smart plug or timer switch. Have devices that do nothing at night or during the day switch off automatically. A timer switch costs between 10 and 50 euro and uses just 0.1 to 0.3 watt itself.
Put devices in eco or energy-saving mode. Many set-top boxes and games consoles have a deep sleep mode that cuts standby draw sharply. A quick dive into the settings really pays off here.
Unplug chargers when they’re empty. Each one is little on its own, but a full house of chargers, toothbrush holders, and adapters adds up. It also saves wear.
Consider switching the router off at night. This can save a router of around 5 to 12 watts. But mind the downsides: no updates at night, no smart devices staying connected, and sometimes a slow restart in the morning. Only do this if you’re sure you need nothing online at home overnight.
Which devices you should NOT just switch off
Hunting standby drain is good. Blindly killing everything is not. Leave these devices alone:
- Fridge and freezer. They need to cool. Switching them off means spoiled food and no saving worth having.
- Boiler and heating pump. Cutting the power can throw the heating out of whack and, in winter, even risk freezing. The boiler should always stay on.
- Modem or router if you work from home or have smart-home kit. Smart thermostats, cameras, alarm, and security all need a connection. Switching off earns a few euro and a whole lot of hassle.
- Devices that update firmware at night. Some TVs, games consoles, and smart devices update overnight. Hard-switching them off every time can block updates.
- Underfloor heating pump during the heating season. It’s part of your heating system, so leave it alone while you’re heating.
So the art is this: tackle the avoidable vampires and let the essential baseline run.
What does a power meter cost, and does it pay for itself?
A power meter of 10 to 15 euro almost always pays for itself. If you use it to find a single drainer of around 10 watts that you can switch off permanently, you’re already saving about 25 to 30 euro a year. The meter then pays for itself within half a year and lasts for years after that.
Smart plugs with monitoring (roughly 10 to 25 euro each) pay for themselves as soon as you use one to automatically switch off a cluster drawing 20 to 40 watts together. Reckon on about one to two years to break even, depending on how much the cluster was using.
In short: the investment is small and the odds of recouping it are high. The only real cost is a bit of measuring and setting up.
Common mistakes and misconceptions
“Off at the button is always zero watts.” Often not. Many devices stay live after you press the power button. Only pulling the plug or flipping a switch makes them truly dead.
“New devices no longer have standby drain.” Partly true. Thanks to EU rules, the standby draw of individual devices has dropped sharply. But network features, always-on connections, and instant-on modes mean it’s actually creeping back up for some devices.
“Watts per hour.” You hear people talk about “watts per hour”, but that’s not right. A watt is already a measure of power at a single moment. You calculate your energy use in kilowatt-hours (kWh): power times time.
“Saving on a single charger is worth it.” One charger costs you a few tens of cents to a euro a year. The real money is in the set-top box, water heater, router, and PC setup. Start there.
Frequently asked questions about standby power drain
What is the difference between standby drain and phantom load?
Nothing meaningful. They’re two terms for the same thing: electricity that devices pull while you’re not using them. You’ll also hear “vampire power”. They all mean the same.
How much can I save by tackling standby power drain?
You can avoid roughly three quarters of the average standby drain of 450 kWh. That’s about 330 kWh, or roughly 100 to 115 euro a year at an electricity price of 0.30 to 0.35 euro per kWh. In a fully kitted-out home it can be more.
What is the biggest power drainer in the home?
Usually the cluster around the TV (decoder, soundbar, and media player) and devices that are permanently live, such as a TV decoder or a small electric water heater. The TV itself is often fine these days; the peripherals are the culprit.
Is it bad for devices to keep switching them fully off?
For most electronics, no. Just be careful with devices that update firmware at night, with connections that need to stay on (smart home, security), and with anything tied to your heating or cooling. Those you leave alone.
Can I measure standby drain without buying anything?
Yes. At night, switch off everything you deliberately use and read your smart meter or P1 port. The power that’s left is your baseline plus standby drain. To measure per device, though, you do need a power meter or a smart plug.
How much does a charger left in the socket use?
A modern charger with no device attached pulls very little, roughly 0.1 to 0.5 watt. Each one costs you at most a euro a year. With ten chargers it does add up, so it’s worth folding them into your tidy-up round, but start with the bigger drainers.
Want to go beyond just standby drain and make your home structurally more efficient? At Fred you’ll find practical help and plans to make your home more sustainable step by step and cut your electricity bill for good. Have a look around at energy-crusher.fredsdiyplans.com for smart ways to save energy, from small tweaks to bigger projects.