Abstract: A solar reflector system for reflecting solar energy to an elongated solar receiving area disposed in an east-west or nearly east-west direction, and for helping to optimize the performance versus cost ratios of concentrating solar collector systems incorporating said reflector system. The solar reflector system comprises an elongated side reflector panel means to be hinged, at or near the appropriate edge of its reflector surface, about an axis that is parallel to and at or near a side of said solar receiving area. The reflector surface of said panel means is comprised of a plurality of flat planar relatively inexpensive reflector panels that are each elongated parallel to said solar receiving area for about the length of said solar receiving area, and that are assembled so as to comprise a curved (angulated) reflector surface.