Abstract: A power generating device for generating an electrical current from an updraft in a tower includes a tower, a rotor assembly, and a set of generators. The tower is hyperboloid type so that the tower is configured to generate a pressure differential between a base and a top of the tower. A set of openings that is positioned in the tower proximate to the base is configured to allow passage of air from the base through the top. The rotor assembly is coupled to and positioned in the tower so that a set of blades of the rotor assembly is configured to be rotated due to the air passing through the tower. Each generator is operationally coupled to a drive shaft of the rotor assembly so that the set of generators is configured to convert kinetic energy of the air to an electrical current as the drive shaft is rotated.