A power generating apparatus of renewable energy type which generates power from renewable energy, the apparatus comprising: a blade; a rotating shaft which is configured to be rotated by the renewable energy received via the blade; a hydraulic pump which is configured to be driven by the rotating shaft and which generates pressurized oil; a plurality of hydraulic motors which are configured to be driven by the pressurized oil; a plurality of synchronous generators which are connected to a grid without an intervening frequency-conversion circuit and which are respectively coupled to the plurality of hydraulic motors; a motor controller which is configured to adjust a displacement of each of the plurality of hydraulic motors independently; and a synchronizer which is configured to supply a command value of the displacement of each of the hydraulic motors to the motor controller so that before the synchronous generators are connected to the grid, a frequency and a phase of a terminal voltage of each of the synchronous generators are synchronized with the grid, wherein the number of sets of the synchronous generator and the hydraulic motor is N where N is an integer not less than two, wherein the N synchronous generators are configured to be connected to the grid sequentially in response to increase of a flow speed of the renewable energy, and wherein the synchronizer is configured to supply the command value to the motor controller to synchronize the frequency and the phase of the terminal voltage of an (i+1)-th synchronous generator (20 i+1) with the grid when an output of an i-th synchronous generator (20 i) is lower than a rated power of the i-th synchronous generator (20 i), where i is any integers from 1 to (N-1). a blade; a rotating shaft which is configured to be rotated by the renewable energy received via the blade; a hydraulic pump which is configured to be driven by the rotating shaft and which generates pressurized oil; a plurality of hydraulic motors which are configured to be driven by the pressurized oil; a plurality of synchronous generators which are connected to a grid without an intervening frequency-conversion circuit and which are respectively coupled to the plurality of hydraulic motors; a motor controller which is configured to adjust a displacement of each of the plurality of hydraulic motors independently; and a synchronizer which is configured to supply a command value of the displacement of each of the hydraulic motors to the motor controller so that before the synchronous generators are connected to the grid, a frequency and a phase of a terminal voltage of each of the synchronous generators are synchronized with the grid, wherein the number of sets of the synchronous generator and the hydraulic motor is N where N is an integer not less than two, wherein the N synchronous generators are configured to be connected to the grid sequentially in response to increase of a flow speed of the renewable energy, and wherein the synchronizer is configured to supply the command value to the motor controller to synchronize the frequency and the phase of the terminal voltage of an (i+1)-th synchronous generator (20 i+1) with the grid when an output of an i-th synchronous generator (20 i) is lower than a rated power of the i-th synchronous generator (20 i), where i is any integers from 1 to (N-1).