No reason for it to be, just power the machines from cheap renewables like solar. Solar has never been cheaper. If you have the right climate it's cheap and easy to set up a massive array.
A lot of crypto miners do situate in areas where power is cheap (near dams), going to waste anyway due to overproduction (again dams) or have a high amount of renewable energy, like Texas and their wind farms.
However, referring to comments a little further up, I agree that someone's personal choice to avoid mining stocks for the power use to be completely valid.