Data from comparison and switching service Uswitch.com says the total amount charged will increase by more than £200 million, unless customers move to a cheaper plan and avoid a standard variable tariff – some of the worst value energy plans on the market.
Uswitch says the cheapest fixed deal is currently the Simple and SuperGlow tariff from Avro Energy at £810 for 12 months, more than £300 cheaper than the default price cap.
Sarah Broomfield from Uswitch, said: “There are 125 fixed deals coming to an end in July and August, and it’s important to bag yourself a new one before you get dumped on your supplier’s standard variable tariff.
“With some families facing financial difficulties and uncertainty at the moment, no one should be paying more than they need to for their energy.
“Britons could face an average £149 price hike if they do not take action and switch to a cheap deal now to avoid rolling onto a poor value Standard Variable Tariff.
“If you’re unsure about when your deal might be coming to an end, check your energy bill or use our online guide about tariffs ending soon to point you in the right direction.”
Find out more here.