Scottish and Southern Energy (SSE) has apologised that it is putting up its domestic gas tariffs by 9.4 per cent at the start of December. SSE blamed the increasing wholesale cost of buying gas which it said had gone up by a quarter since March this year. "The last few months have been marked by rising wholesale gas prices and, having absorbed losses in our gas supply business for some time, we cannot delay an increase in retail prices any longer," said Alistair Phillips-Davies, of SSE. "I am sorry it will take effect during the winter period."