Bord na Móna has confirmed that it will make up to 430 employees redundant.
A voluntary redundancy programme is expected to be rolled out by the organisation soon, and the redundancies are expected to effect anywhere between 380 and 430 employees.
The redundancies come as a result of Ireland's decreasing reliance on fuels such as peat, a traditional source of energy in Ireland.
Bord na Móna has switched focus in recent years, and is currently investing in wind farms, renewable gas plants and biomass.
New Chief Executive of the semi-state body Tom Donnellan said that Bord na Móna is facing some "extremely difficult choices" as Ireland moves towards more renewable sources of energy.
It is not just peat farmers who will be affected by the redundancies — as Donnellan has also confirmed that some managerial and administrative workers can also expect to lose their jobs.
Bord na Móna is headquartered in Newbridge, County Kildare.
