You need to look at what they have said could be done, then had to change, and not just once.
They also have the luxury of huge demand sites producing Aluminium that they can say stop using power, come the day they do not have that, you will see just how hopeless they are.
(That means Nev the % you see they have written there does not take any of that into account, they have come up with how good they are them selves)
