I agree that most of the reason for the Utah location is probably cost, but the demographics are also very unique (and yes, fairly homogeneous as well).
And if you want to be really pedantic, then you have to admit that most anything can be considered unique at fine enough levels of detail. But there is no point to calling something "unique" then; it loses meaning if everything is in fact unique. Uniqueness really is more of a spectrum, when applied to the real world.
edit: Thanks for the clarifying comments, I didn't catch that the comment was referring to the grammer.
http://dictionary.reference.com/browse/unique
5. not typical; unusual: She has a very unique smile.[edit] I looks like I was off, they really just maxed out BG&Es power grid. here's the slashdot article from 09: http://developers.slashdot.org/story/09/07/02/0333202/nsa-to...
(Maybe it's an ironic twist that the NSA must spread out simply due to grid capacity constraints...)
I imagine the regulatory environment surrounding generation in California and local opposition to big ugly infrastructure are much bigger factors in the prices than the technical capacity to actually upgrade the power grid there.
http://www.npr.org/2012/03/12/148252561/on-utahs-silicon-slo...
And the (empty) HN discussion: