Broadband Router Electricity Cost UK 2026: Why "Always On" Is Not the Bill You Think

How much is the broadband router electricity cost?

Here is the simple sum. Cost equals power × time × your rate. A typical router pulls about 10 watts, which is 0.01 kilowatts. Leave it on all year, all 8,760 hours, and it uses about 88 kWh. At the price-cap rate of 24.67p per kWh, that is about £22 a year, or roughly £1.80 a month.

That is it. Less than a cup of coffee a month for the thing that runs your whole home internet, day and night. And that is the first honest point most articles skate over: the broadband router electricity cost is tiny almost however you use it. The interesting question is not "is it cheap?" but "why does everyone worry about it, and what should they worry about instead?"

The belief that costs people money

Most people assume that because the router is always on, it must be expensive. It feels logical: a device that never sleeps surely racks up the bill. So they switch it off overnight to "save money". But "always on" does not mean "always costly". The cost of leaving a router on all the time is small precisely because the power is small.

Think of it like a dripping tap versus a running shower. The router is the slow drip: 10 watts, all the time. A shower is the gusher: 8,500 watts, but only for ten minutes. A slow drip left on for a year still loses less water than a few showers. Time does not make a small trickle big. It just makes a small number feel scary.

Why most "router running cost" articles get it wrong

Open the top results for this search and you will find the same article copied a dozen ways: one wattage, one price-cap rate, a fixed table, and the line "switch it off at night to save!" Three problems with that:

• ✓It uses their rate, not yours. If you are on a fixed deal at 22p, or a different region, every number in their table is wrong for you;
• ✓It tells you to switch the router off to save money, without warning you that doing so can backfire and slow your broadband down for good;
• ✓It points the finger at the router and stops there, when the router is one of the cheapest always-on devices in the whole house.

That is why the calculator below uses your rate. Type the price per kWh from your latest bill and the whole table re-prices for your home.

How much electricity does a wifi router use, next to everything else?

This is the comparison that puts the router in its place. Here are the common "always-on" devices in a UK home, with the numbers shown, not hidden:

Look at the order. The router is the cheapest always-on thing on the list, at about £22 a year. A fridge-freezer quietly costs £37, a set-top box left in idle can hit £39, and a games console sitting in "instant on" mode burns about £27 doing nothing. The router gets all the blame because it has a glowing light and a name everyone knows, but it is the small fish.

Why switching the router off can cost you speed

Here is the non-obvious bit, and it is the reason this whole page exists. Switching the router off overnight saves you about 6p a night, roughly £22 a year if you somehow turned it off every single hour. But UK broadband lines run something called Dynamic Line Management, or DLM. In plain words: your provider's system watches your line and quietly tunes your speed to keep it stable.

DLM treats every disconnection as a warning sign. If you keep switching the router off and on, the system can read your line as unstable and step your speed down on purpose to stop it dropping out. That slow-down can stick around for days, or longer. So the nightly habit that saves you 6p can leave you with slower internet for weeks. The juice is not worth the squeeze.

The rule the energy tips never tell you The router is one of the very few always-on devices you should not switch off to save money. The saving is pennies, and the risk is a throttled line. Leave it on. Spend your effort on the cluster of bigger always-on devices instead: the set-top box, the console in "instant on", the chargers and gadgets that quietly add up to the real £30–£60-a-year "vampire" load. Stop guarding the router; hunt the cluster.

Best broadband router electricity cost: is a newer one cheaper?

If you want the best broadband router electricity cost, the honest answer is: it barely moves. A modern Wi-Fi 6 router might pull 8 watts where an old one pulls 12, a difference of about £9 a year. That is real, but it is not a reason to rush out and buy one. Mesh systems with two or three nodes are the exception: each extra box is another router-sized trickle, so a three-piece mesh can cost roughly three times as much, around £60 a year. If you have nodes plugged in for rooms you never use, unplug those, not the main router.

What to actually do

• ✓Leave the router on. The saving from switching it off is pennies, and it risks a slower line through DLM. This is the one always-on device to leave alone;
• ✓Hunt the cluster instead. Switch the set-top box off at the wall, drop the games console out of "instant on", and unplug chargers that sit idle: that is the real £30–£60 a year;
• ✓Unplug spare mesh nodes in rooms you never use. Each node is its own little router cost;
• ✓Put in your real unit rate, not the price cap. A lower fixed-deal rate cuts the cost of the router, the fridge, and everything else you own at the same time.

The bottom line

A broadband router costs about £22 a year and £1.80 a month: one of the cheapest always-on devices in the house. It feels expensive only because it never switches off, but a small trickle stays small no matter how long it runs. Knowing that flips the usual advice on its head: do not switch the router off to save money, because the saving is tiny and you risk a throttled line. Hunt the bigger always-on cluster instead. And the single biggest lever on any of these numbers is still your electricity rate, which is why it is worth checking you are not overpaying for the kWh in the first place.