combustionmeans any oxidation of fuels, regardless of the way in which the heat, electrical or mechanical energy produced by this process is used, and any other directly associated activities, including waste gas scrubbing;
electricity generatormeans an installation that, on or after 1 January 2005, has produced electricity for sale to third parties, and in which no activity listed in Annex I is carried out other than the “combustion of fuels”.’;
greenhouse gasesmeans the gases listed in Annex II and other gaseous constituents of the atmosphere, both natural and anthropogenic, that absorb and re-emit infrared radiation;’;
Units using exclusively biomassincludes units which use fossil fuels only during start-up or shut-down of the unit.