Standby power is real and smaller than the folklore claims

Where the advice came from

For a period, the criticism was fair. Televisions, set-top boxes, audio equipment and countless power adaptors of an earlier generation drew a genuinely significant amount while doing nothing, because the transformer-based supplies inside them consumed power whenever they were plugged in, whether or not anything was switched on.

Regulators across several jurisdictions responded, and standby consumption limits are now written into product rules in much of the world. The effect has been substantial: equipment designed to meet those limits draws a small fraction of what its predecessors did in the same state.

The advice, however, outlived the problem, as advice tends to. Switching a modern television off at the wall each night saves a quantity of energy that is real, measurable with the right instrument, and too small to justify the effort. That is an uncomfortable thing to say in an energy publication, and it is true.

What still deserves attention

Some categories remain worth finding, and they share a characteristic: they are not in standby at all, they are running.

Network equipment is the clearest case. Routers, mesh nodes, network storage and anything providing a service to the household run continuously by design, twenty-four hours a day, every day of the year. Each individual draw is modest and the multiplication by hours is what makes it count. The same applies to a media server, a security system, a doorbell transformer or a small computer left on to do something once a day.

Then there is old equipment, which is exempt from nothing because it predates the rules. A second refrigerator or freezer in a garage, an ageing set-top box, a hot tub or pond pump, a towel rail with a broken thermostat, an underfloor heating loop nobody switched off — these are the finds that actually matter, and they are found by measurement rather than by switching things off at random.

Measure rather than guess

The single most useful tool here costs very little: a plug-in energy monitor that sits between the socket and the appliance and totals consumption over days. Guessing which devices matter is unreliable, because power draw does not correlate with size, noise or apparent activity, and a small quiet box can easily consume more than a large silent one.

The complementary approach uses the whole-house data. Look at the overnight floor on a consumption profile — the lowest level the house reaches while everyone is asleep — and that is the continuous load. Then switch circuits or devices off in sequence over successive nights and watch the floor move. It is slow and it identifies things a plug meter cannot, such as a hardwired load.

What usually emerges is that the continuous load is dominated by two or three items and that the long tail of chargers and standby lights is genuinely trivial. That is a useful thing to know, because it directs attention at the offenders and gives permission to stop worrying about the rest.

Keeping the quantity in proportion

The clearest way to see the scale is to compare against something that heats. Anything that converts electricity into heat — an oven, a kettle, an immersion heater, an electric shower, a tumble dryer, a resistance heater — draws in one hour what a modern standby load takes weeks to accumulate.

That comparison is not an argument for waste, and it is an argument about where attention is worth spending. A household that eliminates every standby load in the building and then heats water inefficiently has optimised the wrong end of its consumption by a very large factor.

It also explains why the standby question feels more important than it is. Standby is visible, it involves a small moral choice repeated daily, and it feels like diligence. Water heating and space heating are invisible, involve infrastructure rather than habit, and are where the energy actually goes.

The reasonable middle position

There is a version of this advice that survives scrutiny. Put the small cluster of always-on entertainment equipment on one switched socket strip, so that turning it off is a single action rather than a chore, and leave it at that. Unplug things that are genuinely never used. Replace or remove old equipment that measurement has shown to be drawing continuously.

And then stop. Chasing charger bricks around the house at bedtime is not an energy strategy, and treating it as one displaces effort from measures that would save considerably more.

Where a household does want to act on continuous loads seriously, the productive question is not what can be switched off but what is running that nobody chose to run. Those are found by looking at the data, and they are usually one or two things rather than twenty.