Here you can find a typical sankey like I would use.
https://www.dezem.de/sites/default/files/pictures/sankey.png
What I suggest is that I can give selected values labels like source and target. So I can say that a value flows from [source] to [target]. This will build a tree that shows how energie is providet and how it ist used.
A typical way to fill such a diagramm ist a table like this:
source,target,value
Wirklast,atlas,150
atlas250,zm6-7120,50
atlas250,zm6-7103,50
and so on…
In the example you see left the required energie (Wirklast) for the compressed air production. Next you see, that there are two engines(Atlas 160 & Atlas250) to do this. They share the energie. Both of them provide some “customers” with air. (The values in my example are fake)
I know my english is not very good, but I hope you understand what I mean.