Fluidized beds belong, in recent years, to the main development trends of power generation objects. High oxidation of the fuel's particle, presence of calcium compounds and comparatively low combustion temperatures decide about small emissions to the atmosphere and high efficiency of the process. Specific character of fluidized beds allows combustion of not only traditional fuels but also energy carrying materials and wastes. In number of countries slimes, flotation rejects and barren rock generated in the process of coal winning and coal beneficiation are uses as basic or supplementary fuels; timber rejects and biomass; communal wastes, etc Coal combustion products generated in the process of combustion in fluidized bed, are considerably different from fly ashes and bottom ashes obtained from dust furnaces and multi-layer ones. In fluidized beds more ashes are generated due to addition of limestone and its reaction with sulphur oxides and usually combustion of low calorific value fuels. Depending on composition and physical, chemical properties part of fluidized beds ashes is re-circulated to beds to improve the effectiveness of utilisation of the fuel and limestone. In case of combustion of coals and their wastes fluidized bed combustion are applied, among others, for production of building materials, execution of civil engineering objects and in underground mining Fluidized bed combustion ashes generated in combustion of other wastes and non managed ones by petrifaction or vitrification are suitable for safe disposing in the natural environment. In the country having at a disposal of large volumes of energy carrying wastes, development of modernisation of power generation of small and medium installed power should, to a greater degree, be based on fluidized beds adjusted to manage the local wastes.