These have already gone bust this year, DTC:
Simplicity (January 27)
Green Network Energy (January 30)
HUB Energy (August 9)
PFP Energy (September 7)
MoneyPlus Energy (September 7)
Utility Point (September 14)
People’s Energy (September 14)
Bulb (which is the 6th biggest supplier) has been seeking emergency funding and so looks to be in trouble. Green is expected to go under soon.
This graphic (which incorrectly shows Bulb as having already failed) shows who the big firms are (who might well be expected to survive) and who the smaller, more vulnerable ones are:
https://i.dailymail.co.uk/1s/2021/09/21/09/48186653-10008673-image-a-1_1632212474115.jpg