The station currently burns a combination of peat and biomass.
A decision on major changes to Edenderry Power Plant will be made later this month.
Permission is being sought to use biomass fuel only from 2024.
The Bord na Móna facility currently has permission from Offaly County Council and An Bord Pleanála to burn a combination of peat and biomass.
Edenderry Power Limited is proposing increasing the volume of biomass consumed from the current maximum of 300,000 tonnes to 530,000 per year.
A decision is due from the local authority on 22nd January.