The invention relates to a method for dismantling a wind turbine and erecting a wind energy generating system, wherein the wind turbine comprises a tower placed on a foundation on a wind turbine site and a nacelle with a rotor mounted on the tower. The method comprises the steps of removing the rotor from the wind turbine, mounting an airborne wind energy system for generating electrical power on a part of the remaining wind turbine via a cable, and electrically connecting the airborne wind energy system to a power grid via a power transmission line.