In this study, tidal current estimation analysis and calculation of tidal power generation potential are performed for a Tokyo Bay model using the extended Kalman filter FEM. When a calculation of tidal power generation potential was carried out as an application of the result of the tidal current estimation analysis, it was found that a similar pattern was observed in the linear and the non-linear system equations. The likely reason for this is that the calculation of the tidal power generation potential is performed by time integration.