The big unanswered question in the market is whether Apple hardware could successfully sell with Windows on it, and by successful, I mean be competitive to a degree that it could grow Apple's hardware share massively.
Data centers like this are what contains the family jewels. They're looking for low-cost real estate and stable sites in terms of weather and geographic activity. It means they've done some work and determined it's one of the least-expensive, safest places they can build.