PURPOSE:To intend to reduce an amount of required catalyst by constituting the system in such a way as setting up a reactor with a held-in catalyst which makes fuel vapor evaporated in a evaporator to react chemically for converting said vapor to a secondary fuel with higher fuel energy to superheat said secondary fuel to be supplied to a gas turbine generator system. CONSTITUTION:Fuel (a) is supplied to a gas turbine generator system 2 through a main fuel line 12a after raised in its temperature through heat exchanging with gas turbine exhaust gas (e) in a fuel treating system. This exhaust gas (e) is adjusted by an inlet damper and an outlet damper 8b, 8c at a branch duct so as to meet the quantity of consumed fuel, and the rest exhaust gas (f) is led to a exhaust boiler system 3 for generating steam and this generated steam is supplied to a steam turbine generator system 4. The fuel treating system is constituted by arranging a superheater 12, a reactor 11, a heater 10, an evaporator 9 and a fuel preheater 7a from flow-in side of the exhaust gas (e). And a catalyst used for endothermic chemical reaction is held only in the reactor 11 for making the fuel vapor from the evaporator 9 to react chemically to be converted to the secondary fuel.
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