There is a separate chart on the energy dashboard for individual devices that are tracked. It would be informative to see these values integrated into the top chart so you can see what proportion of energy is consumed by each device. Maybe like a stacked bar chart. Each bar wold be made up of different colours for different devices, plus a section for energy that is unaccounted for.
I think this would be a very useful future. I just commented here with an idea of how to implement it: Split "Energy Usage Graph" - and make use of the "Monitor single devices"