I'm surprised they placed one in Denmark since Netherlands and West-Germany (ie near Düsseldorf) would be much more central Europe for internet connections.
The big picture I see, is that if you look at the Nordic countries, you see that Finland and Sweden has several (unpopular)nuclear power plants. Denmark has a mix of everything, mostly coal and wind. And Norway get most of its electricity from hydro.
Google has built a data center in Finland, Facebook in Sweden and now Apple will build one in Denmark. And I also believe Microsoft is building a data center in Finland.
But few are considering Norway and that may be because electricity in Norway is already very cheap and neither wind or solar can compete with hydro. And you want additional profit by selling energy to the energy market.
Selling electricity is a good sustainable long term investment.
BTW, in Finland nuclear isn't that unpopular, there's currently a new site under construction.
(There is some trouble building it up, though: because the opponents of nuclear power will put just as much resistance to a site regardless of whether it is a 160 MW or 1600 MW plant, the planners make the site as big as possible, and the suppliers (in this case Areva) haven't considered this in the technology. The local nuclear safety authority is also ultra-safety-conscious, which is good in itself, except when slows down the deployment of a new, quite safe site so that the energy is bought off a Chernobyl-type thing near Leningrad).