A fuel-cell power generation system includes a fuel-cell power generator, a power measurement section for measuring an actual power-consumption value in a household appliance, and a power-consumption estimation section for estimating a future power-consumption value over a given time-period after a given time point, in accordance with the actual power-consumption value measured by the power measurement section. Moreover, the system includes a power-generation instruction section for determining the need of startup/stop of the fuel-cell power generator in accordance with the estimated power-consumption value from the power-consumption estimation section.