The objective of the project is identification of the issue concerning meeting of presumed Hg emission limits in single energy sources burning fossil fuels in the Czech Republic and a draft of technical and economical solution to meet predicted Hg emission limits at fossil fuel burning. Measurement in the existing energy sources will be performed to determine concentration of Hg in flue gas in forms of Hg0 (gaseous atomic mercury), Hg2+ (gaseous oxidized mercury) and HgP (gaseous Hg bonded with solid particles, such as fly ash, possibly also the burnable part of the combustible matter in fly ash). Consequently, the project will follow on a pilot plant, where the effect of realistically available methods (in particular that of SCR – selective catalytic reduction) on Hg concentration in flue gas will be investigated. The result of the project solution will be technical documentation for the existing energy sources modifications, or preliminary documentation of new plants determined for Hg emission elimination.