This tool would be quite a handy tool looking at the purpose it would server. At least it would help miners estimate their cost in setting up a mining rig and decide if it would be advisable to go into mining looking at the fact that mining is really not profitable as it used to be especially if you are mining individually.
If someone is considering mining and they don't know their kWh cost; this tool is an easy way to find out.
If your kWh cost is not below 0.10, you are better off buying coins directly at an exchange.