Standby power: stop your devices wasting energy

Standby power goes by several names — phantom power, vampire power, idle load. Whatever you call it, the idea is the same: electricity drawn by a device that is switched off or not doing anything useful.

What standby power is

When you press the off button on a television or mute a speaker, it usually does not fully cut power. It enters a low-power state that keeps a receiver circuit listening for the remote control, maintains a clock display, preserves settings, or stays ready to spring back to life instantly. That background draw is standby power.

It is also worth distinguishing types:

• True standby — the device appears off but is waiting for a signal (remote control, wake-on-LAN, etc.)
• Active standby / passive standby — some devices are genuinely off but the power supply itself draws a trickle just by being plugged in
• Idle power — a device is technically on but doing nothing (a desktop PC that is on but unused, a microwave not heating anything but showing its clock)

Modern regulations have brought standby consumption down on many new appliances. But older devices — especially entertainment equipment, set-top boxes, and older game consoles — can still draw significantly more than their replacements.

Common culprits

Not all devices are equal. Some standby draws are negligibly small; others are large enough to matter. These are the ones most worth investigating:

• Set-top boxes and satellite/cable receivers — these are often among the worst offenders. Many download programme guides and software updates overnight, running continuously at moderate power. Some cannot be meaningfully switched off without losing functionality.
• Games consoles — consoles with fast-resume or always-on network features (some PlayStation and Xbox models) can draw considerably more in standby than a basic TV. Enabling the console's deep-sleep or power-saving mode in settings makes a significant difference.
• Televisions — modern TVs are much better than older ones in standby, but large, older screens can still draw a few watts. The "quick start" or "instant-on" feature keeps the TV more ready but uses more power — disabling it reduces standby draw.
• Audio systems, soundbars, home theatre receivers — often left on or in standby continuously, and some draw more than you'd expect.
• Desktop PCs and monitors — a PC in sleep mode uses less than one in full operation, but still draws power. Monitors in standby are generally low, but turning off the power strip is cleaner.
• Microwaves — the clock and control panel run continuously. A microwave cooking only a few minutes a week but displaying the time 24/7 may use more energy on the clock than cooking.
• Phone and device chargers — a charger plugged into the wall but not connected to a device draws a small amount. Each individual charger is minimal, but a home full of phone, tablet, laptop and accessory chargers left plugged in adds up.
• Smart home devices — smart speakers, hubs and bridges are designed to be always on and listening, so they do draw continuous power. That is their intended use, but it is worth knowing.

How it adds up

A single device drawing 3 watts in standby uses a small amount of electricity on its own. But a home with ten or fifteen devices each drawing a few watts — running continuously, 24 hours a day, 365 days a year — accumulates a meaningful total. The exact amount depends on how many devices you have, which models they are, and your local electricity price. Energy monitors (plug-in energy meters) let you measure exactly what any given device draws and work out the real cost in your home.

To put it in perspective: standby power across a typical home is generally estimated to account for a few percent of total household electricity use. It is not as large a saving as improving heating controls or switching to LED lighting, but the fixes cost little or nothing to implement.

How to find and cut standby power

There are several practical approaches, from free to low-cost:

• Switched power strips. One switch cuts power to everything plugged into the strip — a TV, soundbar, console, streaming stick and blu-ray player all off at once. Cheap, reliable, and requires no technology.
• Enable device power-saving settings. Many TVs, consoles and PCs have a deeper power-saving or sleep mode that cuts standby draw dramatically. Check the settings menu. A PlayStation or Xbox set to "rest mode" at full features draws considerably more than one set to "power off" or energy-saving sleep.
• Disable instant-on or quick-start features. TV manufacturers market these as a convenience, but they keep the TV's processor partially active. Turning them off means the TV takes a second or two longer to start — an entirely reasonable trade-off.
• Unplug when not in use. For devices used infrequently — a spare TV, a printer, a holiday appliance — simply unplugging them when not in use costs nothing and removes all draw completely.
• Smart plugs with schedules. A smart plug set to cut power to the entertainment centre between midnight and 7 am means no standby draw overnight without you needing to remember. The plug itself uses a little power, so apply this where the device draw justifies it.
• Measure first. A plug-in energy monitor (a few pounds or dollars) shows you exactly how much each device draws in use, idle and standby. This removes guesswork and helps you prioritise.

What to leave on

Not everything should be switched off. Some devices genuinely need continuous power:

• Fridge and freezer — must stay on at all times.
• Router and network equipment — if others in the household need internet overnight, or if devices need to receive updates.
• Alarm systems and security devices — clearly need continuous power.
• Medical equipment — any device used for health monitoring or treatment.
• Set-top boxes that record overnight — if you use the recording function, cutting power will prevent scheduled recordings. You can often schedule power-off hours in the device's settings to allow recordings but switch off during times no recording is scheduled.
• Devices receiving important overnight updates — some smart home hubs and computer systems benefit from overnight update windows. Check whether this applies to yours and schedule accordingly.

Household standby audit

1. Walk through each room and note every device that has a standby light, a display, or that stays warm when switched off. Include entertainment equipment, computers, kitchen appliances with clocks, and chargers.
2. Check device settings. For each TV, console and computer, find the power or energy settings menu. Look for "instant-on," "quick start," "fast boot," "rest mode" or similar. Switch to the most energy-saving option that suits your use.
3. Identify your entertainment cluster. TVs, consoles, streamers, soundbars and game controllers often sit near one another. Plug them into a single switched power strip so one button cuts them all before bed.
4. Check the home office. Desktop PCs, monitors and printers are frequent standby users. Enable the PC's power plan to sleep after a period of inactivity, and turn the monitor and printer off at the socket when finished for the day.
5. Check chargers. Walk through and unplug any charger not connected to a device. Make it a habit to unplug once charging is complete.
6. Measure anything you're unsure about. Plug in an energy monitor and leave it with a device overnight to see exactly how much it draws. This tells you where investment in a smart plug or power strip will actually pay off.
7. Decide what to leave on using the list above — fridges, routers, alarms. Everything else that passes the "does it need power overnight?" test can be cut.

Your standby power checklist

• Plug your TV/entertainment setup into a switched power strip and use it each night.
• Disable "instant-on" or "quick start" on TVs and consoles via the settings menu.
• Set games consoles to energy-saving or power-off mode rather than rest mode with full network features.
• Unplug chargers that are not connected to a device.
• Turn off the PC monitor and printer at the socket when finished — not just the power button.
• Use a plug-in energy meter to measure any device you suspect is a heavy standby user.
• Keep fridges, freezers, routers and alarm systems on permanent sockets — never a switched strip.