Around half of consumers surveyed by Which? Switch didn't read, or only glanced at the terms and conditions (t&c) of their contracts when they changed their energy supplier.

Consumers looking to switch this autumn need to read the t&c to make sure they're getting the best deal. This could also help them avoid costly extra payments such as exit fees - Scottish and Southern Energy currently charges a £75 fee for cancelling a dual fuel tariff before 31 December 2009.

Customers may also need to look out for penalty charges for late payments or meter fittings, and for being moved to a different, and potentially more expensive tariff when a fixed deal is up.


However, Which? Switch found that energy suppliers were offering extras too, such as charity donations, one month's rebate and free boiler repairs.

Which? believes that energy bills should be simpler and is calling on Ofgem to introduce minimum standards for tariffs, including a summary box with the key facts on all marketing materials.

This would help consumers compare the key elements of a tariff at a glance.

Alison Morrison, Which? Switch, said: "You can expect to receive the largest energy bill of the year after the winter period which is why now is an ideal time to look at switching.

"However, it's essential to read the terms and conditions of your contract to make sure you're not missing out on the best deals or weighing yourself down with extra costs or clauses."

(CD/BMcC)