Abstract: A pair of slightly vertically spaced and inclined large diameter tubular members extend between and open into a pair of plenum structures mounted on elevated portions of horizontally spaced apart natural or man-made structures between which natural wind currents flow at greater than average speeds. The lower air plenum structure includes an air inlet which opens into the wind and the upper air plenum structure includes an upwardly opening air outlet as well as power generating air turbine structure therein. The downwind sides of the large diameter tubes converge toward each other and a small diameter tube extends along the large diameter tubes on the downwind side thereof and is only slightly spaced from the external surfaces from the large diameter tubes. The lower end of the small diameter tube includes means for receiving air therein while the upper end includes means for discharging air therefrom into the higher air plenum structure.

Abstract: A structure designed to be placed in an existing pass in a mountain range comprises a framework having a plurality of individual passageways through which moving air may travel. Each passageway contains a separate wind driven propeller structure which can be operated by air moving through the passageway from either direction. Each end of each passage contains a covering for selectively closing off that passageway. The passageways are laterally aligned in horizontal rows and vertical columns and adjacent each row and column there is one or more semi-cylindrical baffles which are placed to increase the pressure gradient between the inlet and outlet side of each passageway thereby increasing the speed of airflow through the associated passageways. Entrance and exit zones of adjacent passageways are insulated from each other to trap solar radiation in the central zone.