NOVELTY - A cyclone (3) separates primary fluid containing at least 85 weight% solid contents of particle size 3-100 micron and secondary fluid containing no more than 15 weight% of solid contents from gas produced in a fluidized bed gasification furnace (2). A turning melting furnace (4) melts primary fluid and gas containing oxygen, to remove ash content. Bag filter (8) is connected to a power generation unit (110) and filters the secondary fluid.    USE - For generating electricity from organic waste, such as municipal solid waste, sewage sludge, industrial waste material and biomass.    ADVANTAGE - Reduces the amount of gasification gas required for combustion and the amount of gasification agent supplied to melting furnace, thus improving the electrical power generation efficiency and reducing the process cost of waste material. Reduces the dioxin level contained in a purified gas and a waste gas, by setting reformer to specific temperature range and the modification reaction is implemented efficiently.    DETAILED DESCRIPTION - The fluidized bed gasification furnace is supplied with gas containing oxygen and water vapor for thermal decomposition of waste material. The generated gasification gas is separated into primary and secondary fluids containing solid contents oxygen or oxygen-enrichment air is supplied to the melting furnace (4). The secondary fluid includes solid content below a mean particle diameter of 3 micron. A reformer (6) is between the cyclone and the bag filter. Secondary fluid and combustion exhaust gas are introduced into the reformer whose temperature is 800-1400 degreesC. The reformer has a catalyst to change component in secondary fluid, thus forming a mixed fluid. Valves (51,52) are in the flow paths (204,205), respectively. The electrical power generation unit includes a gas turbine and a gas engine operated using unreacted mixed fluid and waste gas containing fluid ejected from the fuel cell. Alternatively, a steam turbine is operated by steam heated using the waste gas of fluid ejected from fuel cell is used. The rate of flow of water vapor supplied to the furnace (2) is regulated, so that the molar ratio of carbon in organic waste and water vapor is 2:1.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of gasification electricity generator facility of waste material. (Drawing includes non-English language text).    Fluidized bed gasification furnace (2)    Cyclone (3)    Turning melting furnace (4)    Valves (51,52)    Reformer (6)    Bag filter (8)    Flow paths (204,205)    Electrical power generation unit (110)