The incinerator at Carronstown, Co Meath, has been given the green light for its expansion plans.
An Bord Pleanála has approved an increase in the Indaver Ireland plant of one-third its current capacity.
The plant will be able to take 200,000 tonnes of waste a year, rather than the current total of 150,000.
The site of the plant will expand by one-quarter and the height of the chimney stack will increase from 40m to 65m.
In its submission to An Bord Pleanála, Indaver Ireland said the new plant will be far more energy efficient and will be able to generate enough electricity for 19,000 homes.
The Bord's decision, which includes 31 conditions, also allows for the plant to accept waste from other counties in the north-east region such as Louth, Cavan and Monaghan.
This 'proximity principle' effectively clears the way for the Meath plant to take waste from the Dublin area as well.
Indaver Ireland now has the capacity at its plants in Cork and Meath to deal with 400,000 tonnes of waste each year.
That is the amount of incineration that Minister for the Environment John Gormley said would only be required by 2016.
An Bord Pleanála is currently considering the application for a waste incinerator at Poolbeg in Dublin, which is scheduled to be able to deal with over 700,000 tonnes of waste.
