It would be helpful to see on the timeline how much energy was consumed by a device in a given period. I have included an attachment showing what I’m suggesting.
Regarding the actual device page itself, I think it would be awesome to be able to tap a usage page, or create a drop down arrow that would let us see a log of when the item was active like from this date and time to this date and time and how much energy was consumed during that period. This would be helpful in identifying usage as well as tracking down what a mystery device may be.