Battery technology is really, really getting there.
And in the absence of any more improvements here (unlikely) you integrate your grids with other countries. That's harder for Ireland, but it's still worth doing.
The sheer number of people in this thread saying, "we need renewables to be independent!", from countries that don't actually manufacture anything, is astonishing.
Also all these economies do make stuff, they just don't employ huge numbers of semi-skilled workers to do so. Most of the factory jobs are gone, but the factories are not. I live in a port city, about a century ago this city had loads of jobs crewing ships and loading cargo but today more work is done by a tiny fraction as many people.
Coal or gas on the other hand...anyone can cut off Ireland anytime.