A technical feasibility study was carried out for a concentrating solar collector system with receiver at ground level to result in an optical design carried out in sufficient detail to enable the sponsor to evaluate cost and potential for using its technology. Potential problem areas were to be identified. The initial efforts consisted of literature searches and weekly meetings to discuss general concepts. Several potential systems were considered, but one configuration, the tower reflector-concentrator, was the only one that met requirements at reasonable technological risk. This system was adopted for detailed development and analysis. The second stage consisted of development of techniques for calculating the optical specifications, a study of funnel concentrators, which also required development of analytical tools and computer programs, and a review of materials and coatings for optical elements.