Significantly increased costs mean that a price increase is now unavoidable. Household prices to rise 9% from 15 Oct: http://t.co/XDFk8D0w
We’re also introducing a new simple standing charge tariff structure and clear fixed monetary discounts. http://t.co/XDFk8D0w
All customers will receive a letter fully explaining these changes in the first two weeks of September.
SSE said the 9% rise, which applies across gas and electricity, will add another £8.53 a month on to the typical monthly direct debit, dual fuel customer - taking the average annual bill to £1,274.
The group committed in January to keeping household bills on hold until October.
– Ian Marchant, SSE chief executive
Unfortunately, the increases in costs that we have seen since making this pledge can no longer be absorbed and mean that we are unable to keep prices at their current levels beyond this autumn.
An increase in our prices has therefore, regrettably, become unavoidable.
SSE, which trades as Southern Electric, Swalec and Scottish Hydro, said it had seen a 14% increase year-on-year in the average price in the wholesale market to secure gas for the coming winter.
Ian Marchant, Chief Executive of SSE, said the company was facing "upward pressure on the costs" it incurs which is why prices had to rise.
SSE's 9% price rise is a threat to inflation's downward trend - utility prices were a big part of high rates last year.
More than 8 million customers will be affected by the increase in tariffs announced by energy company SSE.
Around 5 million electricity customers and 3.4 million gas customers will be hit by the 9% rise, due on October 15.
Energy firm SSE said today that electricity and gas prices will rise by 9% on average, from October 15 this year.