## Represent outlier days

4

I have hourly power consumption data for 30 days. On representing, each day data using a separate line, I get a plot as

I want to highlight the days with abnormally high consumption (in other words, the outlier days). I think that the current plot is too much congested. Is there any other better representation to show the outlier days?

I would like to comment on the usage of the word "outlier", and the consequent interpretation of the data: the accepted answer below fully clarifies what is the best way to visualize peak usage. However, if you want to define the outlier as anomaly, then you have to put an assumption on what the underlying statistical distribution is. In this case, if the power consumption comes for example from a powerlaw distribution, your peaks could be absolutely normal (i.e., likely to occurr). – famargar – 2017-05-05T13:15:34.237