Consumer watchdog Which? have criticised energy companies over its "lack of transparency", after MPs warned that trust was waning.
Which? executive director Richard Lloyd said: "Hard-pressed consumers consistently tell us that the spiralling cost of their energy bills is one of their top financial concerns, with energy companies trusted by fewer than a quarter of their customers.
"People will not feel confident that they are paying a fair price for their energy unless prices are simplified and the costs that make up our energy bills are open, transparent and subject to robust scrutiny.
"The Government and regulator must do more to rebuild trust in the suppliers and to keep prices in check".
More top news
David Cameron has been urged to accept thousands of unaccompanied child refugees from Syria.
The actor and musician, who played character Matt Musgrove on the soaps between 1998 and 2004, has died.
The family of a teenage boy who died after a hit-and-run in Leicester are urging the public to help find the driver of the car.