I. SUMMARY The SPS Reference System concept as defined herein, is largely a product of system definition studies conducted by the Boeing Aerospace Company under contract to the Johnson Space Center (JSC) from December 1976 to December 1977, and Rockwell International under contract to the Marshall Space Flight Center (MSFC) from March 1977 to March 1978. The results of these two system definition studies combined with in-house efforts at both NASA Centers and several smaller contracted studies provided the data from which the Reference System was developed. The two parallel, but independent, system definition studies resulted in well-integrated system concepts in which some major elements were very similar, but others were markedly different. To meet the Reference System milestone with essentially a single concept, a third system was developed by the selection of system elements of the two individual concepts. Part III of this report describes the Reference System. Appendix A describes the various systems analyses that have been conducted. Appendix B describes the independent system definitions developed by Boeing and Rockwell. The Reference System description emphasizes technical and operational information required in support of environmental, socioeconomic, and comparative assessment studies. Supporting information has been developed according to a guideline of implementing two 5 GW SPS systems per year for 30 years beginning with an initial operational date of 2000 and with SPS1s being added at the rate of two per year (10 GW/year) until 2030. Figure 1 illustrates the Reference System concept, which features galliumal uminum-arsenide (GaAlAs) and silicon solar cell options. The concept utilizes a planar solar array (about 55 km ) built on a graphite fiber reinforced thermoplastic structure. The silicon array uses a concentration ratio of one (no concentration), whereas the GaAlAs array uses a concentration ratio of two. A one- kilometer diameter phased array microwave antenna is mounted on one end. The
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