More than 218,000 households could see energy bills rise by as much as £331 with 157 fixed deals coming to an end this month, new research has revealed. With a number of plans expiring in the next two weeks, customers are reminded to switch their tariff before they are put onto a pricey default deal. Rolling off fixed term deals onto default tariffs could collectively cost UK households an extra £61million a year, compared to their current energy costs, an average of £280 per home, the data from Compare the Market shows. Customers on British Gas' Energy and Boiler Cover May 2021v4 would see the potential biggest rise from £806.26 to £1,138.18 - an increase of £331.92.