southwest in a stationary structure the mounting means may be onto the side of a building or on panel supporting means with the orientation of panel 82 about the vertical tilt axis defined by construction or fixed permanently at installation one such embodiment is for stationary pv panels mounted facing an advantageous direction for the purpose of augmenting the electric power supply during certain times of the year one example is during summer months when the demand for electricity reaches a maximum due to increased loads imposed by air conditioning this application of pv technology is called peak demand reduction in the field of electric utility services on site installations where a panel like structure is preferred as in many residential and commercial applications either the stacked or nested configuration may be used with some portion of the upper or interior conical segments s 42 or 62 respectively transparent and mounted with one axis of freedom to obtain the maximum energy production throughout a year the vertical tilt angle of panels 82 may be adjusted periodically over weeks or months as the seasons change this may be accomplished manually or via a pre set control timer and means for mechanical actuation lighting applications where collected and concentrated sunlight enters an interior.