Isn't it still flawed? If a coal plant gets switched off, that needs to be replaced but this graph excludes it. Unless you do it properly rata, but then the graph is essentially showing all generating capacity that's been added?
So this shows us what y is.
But the precise mix that supplied X no longer exists, due to closures, so something must have back filled that x. So is that pro rata from these figures?
Yes I understand this isn't strictly capacity, but in practical terms, wind turbines and solar panels have been installed to allow this increase.