Darren
I purchased electricy and gas for 12 years and was a member of the Main Energy Users Council for a similar period.
The pricing structure of electricity is made up of 4 parts, wholesale, retail, distribution and tax.
The only bit that makes a real difference is the retail side of it, the other 3 are virtually fixed either by cut throat competition or statute.
Your point about a fix rate will never stand up.
Some people are ideal customers, they pay by direct debit and never miss a payment.
The worst customer is those who do not pay and then just before a court case.
You also have the pre paid meter brigade who cost a fortune to service.
The simple fact is that any customer can chose any tariff from the big six and also there are some new smaller companies waiting in the wings.
We all choose the cheapest option, so all is well.
If you find it difficult to compare one company and its tariffs against another, you can employ online agencies who will select the best deal for you for free.
Having a fixed tariff would push up overall rates and would actually push up inflation.
Regards
Mick