This is a very important question. But shouldn't we be asking this of every company and every consumer of all electricity everywhere? What does it have to do with mining. This has to do with electricity production, its regulation and proper taxing.
I have a hard time believing that they pay an appropriate price on any scale. Mining is highly portable and miners will locate their stuff to wherever they get the lowest rate. I would not be surprised if the electricity that miners are running on is government subsidized.