You can track real-time data which is great to see when your house is using peak electricity.

In addition, I find the the long-term data to be very handy for when I'm doing my taxes at the end of the year (whole other topic!). For example, in the image below I know exactly how much energy my miners have consumed over the year. In this case it is 84.4% (Always On) of my current electrical bill. I can then deduct that amount against the profits from my miners which allows me to offset some of the cost of running these machines.