Abstract: The disclosure is directed to a gearbox unit for a wind power generation device, comprising a gearbox; an lubricant supply system or cooling and/or lubricating the gearbox, the lubricant supply system comprising an electric pump discharging the lubricant; a primary power source; a backup power source; and a power controller configured to control a supply of the electrical power from the primary power source and the backup power source to the electric pump. Further, the disclosure is directed to a wind power generation device comprising a rotor; a main shaft; the gearbox unit; and a generator.