Taoiseach Enda Kenny has opened a €100m extension to the Irish Distillers plant at Midleton in Co Cork.
The facility, which was built in a year, will allow the company to double the production capacity of the plant to 64 million litres of pure alcohol.
The plant, which produces Jameson whiskey, had been operating at full capacity to meet demand and the expansion has created 60 new jobs.
Whiskey is big business and the export of Jameson is a huge success story for the Irish food and drinks industry.
Jameson is distilled, matured and bottled in Ireland. It has recorded 24 consecutive years of export growth.
Last year global sales of Jameson reached four million cases.
To cater for growing demand, Irish Distillers has invested €100m in an expansion of its Midleton distillery, where production reached capacity earlier this year.
A further €100m was invested in a new maturation plant in nearby Dungourney.