Re: No Operational Justification for placing a Data Centre anywhere in Ireland
Colin is bang on with his remark about telecom infrastructure aka submarine cables: Ireland is a great location, because it is on the continental shelf at the edge of the Atlantic deep.
The other observation is that Ireland is closer to the USA than any other country in Europe. Geographically, it's true... but also time zones (8 hours off California, not 9), and most importantly linguistically (which is to say neither Californians nor the Irish speak proper English, but the improper English is understandable).
The next best location (culturally) is the Netherlands, but the timezone, distance and cost-per-hectare figures are all worse than Ireland's.