The price cap sets what the average household in England, Scotland and Wales will pay for energy if they’re not on a fixed deal with their supplier.
But your individual bill will be different depending on whether you live in a small flat or a large house and what your energy use is.
It means standard tariffs will go up by 54%.
About 22 million customers will be affected by the change in the price cap when it comes into effect in April.
There’s a different rate for prepayment customers: their price cap will rise by £708 to £2,107.