Wind energy accounted for over a third of total electricity demand in October, according to Gas Networks Ireland's October Demand Statement.
This made it the largest contributor to power generation, as it was during the same month last year.
There were times during the month when wind energy provided over three quarters of the country's energy demand.
It peaked at 76% at one point in the month.
But given the intermittent nature of renewable energy sources, there were times in the month when wind provided as little as 1% of electricity supply.
Gas provided just over a third of power generation across the month, peaking at 62%, while coal provided 15% and peaked at 25%.
Coal was called upon significantly more than it was in the same month last year, when the October peak for coal was 12%.
The remaining electricity demand was met by the interconnection with the UK and other sources including oil, peat and solar.
"The variability of all fuel types in the electricity generation mix, particularly wind and solar, reiterates the importance of having a flexible and reliable gas supply," Brian Mullins, Gas Networks Ireland's Head of Regulatory Affairs, said.
"The gradual return of gas power plants to service should help address peak electricity demand in the coming months. However, this year has shown us that we need to ensure that we have in place the necessary thermal back up for renewables," he added.