Businesses affected by Storm Desmond are to receive emergency payments of up to €5,000 each.
The money will be distributed from a €5 million fund channelled through the Irish Red Cross.
The unvouched payments will be made electronically over the next few weeks and will be in accounts by Christmas.
A second phase of funding, which will be vouched, will be made available in the coming weeks.
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Minister for Defence Simon Coveney and Minister for Office of Public Works Simon Harris are to announce the details later on Thursday.