District heat production from the plant will amount to approximately 740 GWh and electricity to 530 GWh a year. The heat production will correspond to about half of Vantaa’s annual heat requirement. The plant will use about 320,000 tons of source-separated mixed waste as fuel, reducing the amount of waste going to landfill sites.
The waste will be burned in two grate-fired steam generators and the electricity will be produced by a gas turbine and a steam turbine. The live steam from WtE boilers will be superheated before entering the steam turbine in a separate HRSG boiler of the gas turbine. The flue gases from the gas turbine plant will increase the energy efficiency of the plant.
Construction work on the EUR 250 million plant will start this year. When completed, the new plant will reduce Vantaan Energia's use of coal in electricity and heat production by 30% and cut overall emissions by some 20% from the present level. Side products from the plant include bottom ash slag, boiler and fly ash and flue gas cleaning products.
Sources: Ministry for Employment and the Economy, Vantaan Energia