A feature that would be quite useful would be to have graphs in the App / Web for the daily average power usage, and also the weekly cycle. Human behavior varies strongly with time-of-day and day-of-week, and meteorology varies with time-of-day too. So averaging all days on top of each other (and all Mondays, all Tuesdays etc. on top of each other) would produce a less noisy dataset that we could mine for patterns.
There could be different ways to displays this info. The format of the power meter would be good to start. Eventually a box-whisker plot like the one attached (for some research in my field) would be even more useful.
Eventually one would want to select a time window over which to see the averages.