The three suppliers ceased trading last week leaving a combined total of 233,000 customers without a supplier.

A huge spike in wholesale gas prices has led to the collapse of several small providers in recent weeks including Avro Energy, Utility Point, People’s Energy, PfP Energy, Green Supplier and MoneyPlus Energy.

Ofgem said it picked E.ON Next following a “competitive” process to get the “best deal” for customers.

Outstanding credit balances of customers of the collapsed firms will be protected and customers will also be protected by the energy price cap with their new supplier.

If you are a customer of one of the three failed suppliers, you will be contacted over the coming days about the changes. If you wish to switch supplier, you can shop around but Ofgem advises waiting until the transfer has been completed.

You will not be charged exit fees if you decide to switch to another supplier.

Neil Lawrence, Ofgem’s director of retail, said: “I am pleased to announce we have appointed E.ON Next for the customers of  ENSTROGA, Igloo Energy Supply Limited and Symbio Energy. We understand that this news may be unsettling for customers, however they do not need to worry. Their energy supply will continue as normal, and customer credit balances will be honoured.

“Your energy supply will not be interrupted. E.ON Next will be in contact with customers over the coming days with further information. Once the transfer has been completed, customers can shop around for a better deal if they wish to.”