Money Saving Expert Martin Lewis has urged people to check if they are owed £750.
Next month, energy bills will rise by an average of 54% as the price cap is increased significantly. The cap is rising from £1,277 a year to £1,971 on April 1, with further rises expected from October.
But Martin Lewis says many households are paying even more than that. A caller to ITV's This Morning programme yesterday said her annual energy bill was estimated to be £5,000, as she has a son that needs a ventilator for 22 hours a day.