It was getting reasonably efficient compressed air motors of decent size. The MDI docs claim they do about 50hp (or about 37kW). You'd probably want five or ten 'units' at that level (assuming the data center is 10 or 20MW like the ones Apple, Facebook, and Amazon have built).

You can of course run an existing steam engine on air pressure (I've done that with models) but they are optimized for a higher static pressure than the MDI engines target.