A 600 MW coal electric power plant with 32% thermal efficiency substitutes 8% of its fuel with tree clippings, which are tree branches that are cut to clear roads as well as the access lanes (rights of way) of power lines. The tree clippings are fed to the boiler together with the coal. The coal used by the power plant has 83% carbon and a heating value of 26,560 kJ/kg. How much coal is saved annually by this practice and how much CO2 emission is prevented?