But there should be plenty of options once you start actually optimising for the same use-case as space data centres. Many places have very predictable wind (especially off-shore, which gives you bonus access to cooling water). Or maybe you could set up small hydro power schemes along remote rivers.
Perhaps space based DCs allow for expansion into ITAR controlled countries and/or sanctioned countries/individuals.
Maybe throw in the fact that nobody can REALLY verify system behavior once its up there. So NSA/CIA etc sure are chomping at the bit to allow it.
I'm sure there's others I haven't thought of- probably less outlandish/tinfoily as well.