Four coal-burning power units will be shut down in Ontario next year -- two at Nanticoke and two at the Lambton station near Sarnia.
Energy Minister George Smitherman says Ontario Power Generation will complete the closures by October, 2010.
Smitherman says the closures will reduce air pollution and make more room for greener forms of energy on the grid.
Plans to covert the coal-fired plant in Atikokan remain unchanged.
OPG is hoping to begin burning biomass at the Atikokan Generating Station by 2012.