So just seen this in the guardian. Apparently Liz truss doesn't understand it either. Fantastic.
"Truss criticised for wrongly saying no household will pay more than £2,500 under energy price guarantee
In her interview round this morning Liz Truss sometimes gave the impression that her energy price guarantee will mean that no household will face a fuel bill of more than £2,500 a year.
That is not correct. Under the plan, unit prices are capped at a rate that means that the average household will pay no more than £2,500. But if you use more gas and electricity than average homes do, you will pay more. By the laws of maths, half of people will pay more than the average.
Some of the reporting on this probably has not been as clear as it should have been because headlines resist subtlety and making the point that average bills are notionally capped at £2,500 a year probably means more to people than explaining that unit prices are actually capped at 34.0p/kWh for electricity and 10.3p/kWh for gas.
In her interviews, when talking about the £2,500 figures, Truss mostly said it applied to a “typical” bill. (Typical is not the same as average, but never mind.)
But sometimes she said all bills would be capped at £2,500. She told Radio Leeds that people in West Yorkshire would not face energy bills of £6,000. She went on: “Through the energy price guarantee, the maximum will be £2,500.” And she told Radio Lancashire: “This is why we’ve taken action to make sure people’s bills are no more than £2,500.”"