Just to be contrarian: what we're talking about is "electricity use from economic activity". This should be good for Ireland but they'll need to build energy capacity to keep up. It's misplaced to be angry about datacenters themselves. There IS value being created, or people wouldn't use the tools. Construction creates jobs, manufacturing the machines in the buildings is a huge global industry; the value people gain…
The grid is only looking after its capacity. When Grange Castle announced they're adding nearly 200MW of generation (for a nearly 1GW site) planners whoop with joy but that's 200GW of gas turbine for when they've spiked the wholesale price of electricity. It's not grid-surplus storage.
That sort of economic activity drives inflation. Well before you consider maybe-effects like job reduction.