MILLIONS of households were reeling from another rise in energy bills today after British Gas said it would hike prices by as much as 12.4 per cent.

British Gas owner Centrica said its 10.7 million gas customers will be hit by a 12.4 per cent increase on September 4 while its 5.8 million electricity customers face a rise of 9.4 per cent.

British Gas promised customers who signed up for special "price fixed" accounts in April this year that their bills would remain the same until 2009.

They will be unaffected by today's rise.

The company blamed the soaring cost of the wholesale gas it buys to supply its customers which saw British Gas make record losses of é143m in the first half of "its most difficult year".

Losses

The losses at British Gas cut Centrica's overall pre-tax profits from é894m to é569m in the six months to June 30. Centrica said the cost of wholesale gas had soared 71 per cent in the last 12 months, leaving it "no alternative but to increase prices" for its British Gas customers.

Wholesale gas on the market for this winter is now 266 per cent more expensive than it was for the winter of 2002 to 2003.

It is the fourth inflation-busting increase by British Gas in less than two years. It follows a 22 per cent hike in gas and electricity bills by the firm in March.

Earlier this week, rival EDF Energy said it will charge its customers 19 per cent more for gas.