Households have been warned to avoid leaving six specific items on standby to avoid adding money to their electricity bills.
While modern gadgets have become more efficient in recent years and use less power, some devices can still add on money over the course of a year.
It comes as household energy prices are set to soar in January, with a typical annual bill forecast to jump by £276.
The 16% predicted increase would hit millions of households at the coldest time of year, and would mark the biggest rise in bills for four years.
How much do home items cost being on standby over a year?
The price comparison service Uswitch has shared how much certain household items cost when being left on standby:
The item that costs the most on standby is a TV, with it being calculated at 1.02p being on standby for an eight hour period.
If this was left on standby every day for a 365-day year, it would cost £3.72 at the current October rate.
Meanwhile, a games console would cost £3.07 over the course of a year being left on standby, while charging a laptop overnight for the course of a year would cost £2.29.
Alongside that, a smart speaker would cost £1.93, a digital TV box in eco mode / deep standby mode would cost £0.54 and a phone left charging overnight would cost £0.40.
Combining these six items would add on £11.95 over the course of a year.
Ben Gallizzi, energy expert at Uswitch.com, said: "Modern gadgets have become more efficient over the years, so they don’t guzzle as much electricity in standby mode as they once did.
"Some devices around your home can still add to your energy bills while they are on standby.
"These can include charging devices like laptops, tablets and mobile phones, as well as TVs, games consoles, and desktop computers."
Mr Gallizzi said smart plugs could help households control devices easily and avoid unnecessary costs.
He said: "If you’re worried about the cost adding up, you can buy smart plugs that let you turn off devices via an app without physically unplugging them.
"Older TVs, games consoles, and computers may use more power than newer models, so it may be worth turning them off at the wall if they are not used often."
Mr Gallizzi also advised against turning off Wi-Fi routers to save energy.
He said: "It is not recommended that you turn off Wi-Fi routers.
"Broadband networks regularly monitor the speed and reliability of your internet connection, so shutting off your router frequently can make your provider think the line is faulty.
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"This could lead it to slow down the service to your router in order to try to maintain your connection while they check for technical issues."
Mr Gallizzi emphasised that the overall energy drain from most standby devices remains low.
He said: "So don’t have nightmares about vampire appliances sucking your energy while you’re sleeping, as in most cases the amount of electricity lost is relatively small."
Do you leave items on standby overnight at home? Let us know in the comments.
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