Re: Simplistic View
Old suppliers went bust because they could no longer balance their takings with their outgoings - as they are wholly at the mercy of wholesale markets.
Suppliers of last resort (e.g. Centrica, etc.) have to both cover the cost of the "old" bankruptcy, plus ongoing running.
Wait till the DD goes out next month. I'm anticipating many more bounced transactions than normal, defaults wil be up, disconnections will be up. As one of the "better" off, I'll make noise to challenge the government and Ofgem on it's terrible policies and lack of central planning; where they prefer to turn the problems over to a free market - one where someone who has $20bn lying around can dump it all into buying up supply and reselling for $21bn. The only defence against this is who has that kinda cash, and do they want to compete with each other (hint - we've just slapped a ton of sanctions on a lot of those types).
I'm not demanding a return to the bad, dark side of nationalisation and energy rationing (if you don't remember, read up on the Winter of Discontent). Limited working days per week, etc. Thatcher leapt on that and used it as an excuse to privatise the whole lot - dispensing with any and all central planning. And in doing so, also contributed to the current problems... You see, the old CEGB plan was to build a bunch of Nukes to the design of Sizewell B; plus wind, and bits of gas/coal as backup.
What we have now is no new nuke for 2 decades (Heysham being the last "new" one); 3 decades of coal winding up; and an awful lot of gas burners that, unsurprisingly are expensive to run and at the whim of the markets.
So yes, a modicum of central planning regarding generation split (e.g. France, and it's large, though admittedly old nuclear fleet that needs replacement) would have gone an awfully long way. And now it's too fucking late. Again, wading from crisis to crisis instead of doing it's job to forward plan effectively.
Being employed in this line of work does somewhat give insight into lunacy that haunts the UK civil service. All so frustrating that there are solutions if anyone would think beyond the end of their nose.
See also, China, playing a very-long game; and it has gotten quite good at it.