People are being warned about five 'vampire' appliances that can add £290 a year to your energy bill - even when you think they're turned off.
They're things you use every day, and you may think you've turned them off, but they could be adding hundreds to your yearly energy bill.
According to British Gas, up to 23% of British homes' energy use could power vampire appliances - that's £293 of the average energy bill capped at £1,277 a year.
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The cost of variable rate energy bills for the average household is capped by regulator Ofgem. That cap is rising from to £1,971 on April 1 .
Energy expert Rob Bohm says these devices add up to billions of pounds in wasted power every year.
Bohm said: "They're electrical appliances, chargers and lights all over your home, devices that suck power from the mains — constantly — even when you think they're switched off."
Five vampire appliances - and how much they cost you
- Hi-Fi system on standby - £73 a year
- Sky box on standby - £73 a year
- Laptop charger not in use - £60 a year
- TV on standby- £10 a year
- Printer on standby - £10 a year
Bohm said that when you turn your television off, make sure you do it at the wall.
This is because TVs use a small amount of power to make them quicker to turn on.
That might be convenient, but it is costing you money.
He said the same thing applies to dishwashers and washing machines, as well as electronics such as gaming consoles and computers.