How can they write an article about a solar mining op and not say hardly anything about what powers these rigs (assuming they run 24/7) for the hours when the sun isn't shining?

I can't tell -- it seems like this referring to the Texas operations, or is it the Colorado site? If this is only for offtaking power from the solar farm, again ... what's powering the rigs in the night, the evening, and the early morning when the solar isn't producing any (or enough) power to run the rigs?