SSE has become the first of the so-called ‘big six’ energy firms to confirm it is to raise its prices ahead of the winter months.
The company said household gas and electricity tariffs would rise by an average 8.2% from November 15 affecting 4.4 million electricity and 2.9 million gas customers.
It is understood several of its competitors also plan to announce increases to bills later on Thursday.
SSE blamed its decision on rising costs outside its control which it said it had absorbed for months at its retail division.
It said the move would equate to a typical dual fuel customer paying £2 a week more but pledged not to increase bills again until August 2014 having last imposed a 9% increase in October 2012.