NOVELTY - A planar solar energy concentrating unit comprises light transparent first planar portion defined by upper and lower planes, and having light concentrating components (2) integrally formed in first portion between upper and lower planes with concentrating geometries of light concentrating components oriented toward upper plane; and light transparent second planar portion adjoining upper plane of first planar portion.    USE - The invention is for roofing shingle (100) applications, by leaving at least a section along an edge (3) of the unit, without light concentrating components formed in it. It is useful for a roofing structure. It is for use in an electricity generating device. It is used as a solar energy device for converting sunlight to electricity (claimed). It is used in a side-by-side or overlapping array, or in sky-light, facade, or other building material applications, or in a stand-alone arrangement to collect solar radiation, while protecting the solar collector system from weather. It is used to direct sunlight, diffuse and direct, over a wide range of incident altitude and azimuth angles to an absorbing target, such as a photovoltaic cell. It is useful in building or water heating. It can be used for e.g. windows, walls, and other structural components. It is for useful for a thermal energy recovery system used to remove and utilize waste heat.    ADVANTAGE - The invention is a sturdy, durable, relatively inexpensive, non-imaging, non-tracking, and integrally-formed. It can be easily installed. The number of manufacturing steps is reduced.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an electricity generating device, comprising in combination, solar energy concentrating units; light absorbers (15) formed of a photovoltaic material located at base regions of the concentrating units; and electric circuitry to collect electric energy produced by the light absorbers.    DESCRIPTION OF DRAWING(S) - The figure is a section through a solar concentrator showing the limits of acceptance angles for total internal reflection.    Light concentrating components (2)    Edge of concentrating unit (3)    Angle of incidence (13)    Light absorbers (15)    Roofing shingle (100)