NOVELTY - The concentrator has a semi-circular dish assembly (140) mounted on a base assembly (130). A reflector panel assembly includes a set of flat and fan-shaped reflector panels secured to a frame and placed in a semi-circular pattern, where each reflector panel includes a set of reflectors. A support structure (170) includes a fixed end connected to a central mounting structure of the frame, where an elongated beam is extended perpendicular to a plane defined by the frame and a free end is placed adjacent to a focal region defined by a fresnelized reflective surface (165).    USE - Collapsible solar-thermal concentrator for a renewable sustainable expeditionary power generator system.    ADVANTAGE - The concentrator provides a tactical power generator for expeditionary settings that is light in weight and portable and consumes a minimal amount of liquid fuel. The concentrator supplies sufficient concentrated solar energy to power a solar/fuel stirling engine during daylight hours and to be transported in a light tactical trailer and quickly erected by two people without use of ladders and includes a profile that minimizes wind loading and detection. The concentrator maximizes heat energy supplied to the stirling engine, and the renewable sustainable expeditionary power generator system reduces an amount of combustible fuel to be consumed by a burner, thus reducing weight of fuel during expedition. The concentrator forms the support structure, so that the stirling engine can be automatically and accurately maintained at fixed distance from the reflector panel assembly and positioned in the focal region defined by the reflector surface.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a renewable sustainable expeditionary power generator system.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a solar-thermal concentrator utilized in arenewable sustainable expeditionary power generator system.    Base assembly (130)    Semi-circular dish assembly (140)    Fresnelized reflective surface (165)    Support structure (170)    Tracking system (190)