That's enough generation capacity to almost meet projected peak demand :
However, wind energy is not normal generating capacity. A duplicate generation system will have to be maintained alongside all this subsidized wind. How much will all these new wind farms contribute to peak demand - the answer is between 3 and 4%.
That's right, Eirgrid estimate that at least 96% of peak demand will have to be met by conventional, mostly fossil fuel (presumably), sources :
Source : Eirgrid, Generation Capacity Statement 2016-2025