To provide a power generation system in which generation power of a refuse incinerating power generation device can be levelled, and which can contribute to efficient and stable operation of a dust incinerator or a power generator.

In a refuse incinerating power generation device 1 comprising a dust incinerator 10, and a power generator 11 comprising a boiler 11A and a steam turbine 11B, a sodium-sulfur battery 2 is installed, the sodium-sulfur battery 2 is actuated by waste heat of the dust incinerator 10 or steam from the boiler 11A, generated power by the refuse incinerating power generation device 1 is stored in the sodium-sulfur battery 2, and power is discharged from the sodium-sulfur battery 2 in accordance with fluctuation of consumed power at a load 3.