First, what is a data centre? It's simple, it's a large array of computers with very powerful graphic cards. If you have a computer for gaming (or your son has one), you know that they run hot, and need a lot of cooling. So the first thing is that data centers need a lot of cooling, it can be open or closed, but in either case data centers need a lot of water – because in 99% of cases water cooling is the best solution. The next thing is that data centers need energy, a lot of energy, first to run their graphic cards but also to cool the cards. Right now the ONLY solution is the grid, there is no other solution. You could build a coal plant next to a data centre, but the fundamentals are the same, data centers are large energy consumers, full stop. There have been "stories" about nuclear reactors for data centres, but the world is at least a decade away from such a thing happening. Data centers are ubiquitous, far more than people believe ...
Life of a Norfolk farmer