According to some embodiments, a plurality of airborne bodies may each extend horizontally along an axis between a first point and a second point. Each body may be, for example, at least partially filled with a gas and two or more vanes may be provided airborne with each body such that the vanes, when acted upon by a wind force perpendicular to the axis, are operable to cause rotation about the axis. Moreover, one or more electrical generators may be airborne with each body to convert rotational energy produced by the rotation about the axis into electrical energy.