A. SATELLITE POWER SYSTEM CONCEPTS o DEFINITIVE COMPARATIVE ANALYSIS AND ASSESSMENT OF THE SEVERAL POWERGENERATION CONCEPTS - SOLAR CELLS (SILICON, GALLIUM ARSENIDE) - THERMAL (BRAYTON) o RELATIVE MERITS OF LOW-EARTH ORBIT AND GEOSYNCHRONOUS-ORBIT CONSTRUCTION LOCATIONS o CONCEPTUAL DESIGN AND ANALYSIS OF A VARIETY OF CONFIGURATIONS o DETAILED STRUCTURAL, THERMAL, AND ATTITUDE STABILIZATION AND CONTROL ANALYSES (INCLUDING MODELING AND SIMULATIONS) FOR CONSTRUCTION, MAINTENANCE, AND OPERATION PERIODS o IN-DEPTH ANALYSIS AND EVALUATION OF EACH SUBSYSTEM/MAJOR COMPONENT EFFICIENCIES o RECTENNA ANALYSES WITH EMPHASIS ON REDUCING COSTS AND CONSTRUCTION ENERGY AND NATURAL RESOURCE REQUIREMENTS o DEVELOPMENT AND OPTIMIZATION OF SYSTEM AND DETAILED CONCEPTS FOR SPS-POWER GRID INTERFACE AND OPERATION B. SUPPORT SYSTEMS o CONCEIVE AND EVALUATE TECHNIQUES AND DEVICES FOR CONSTRUCTION, INSPECTION, AND MAINTENANCE OF SATELLITE POWER SYSTEMS, INCLUDING DESIGN CHARACTERISTICS OF A CONSTRUCTION FACILITY WITH ASSOCIATED UTILITY, HABITATION, AND CONTROL FEATURES o REFINE STUDIES OF HEAVY LIFT LAUNCH VEHICLES - WINGED LAND LANDING VS. BALLISTIC WATER LANDING - PAYLOAD/FLEET SIZING - OPERATION COST ANALYSIS - FACILITY REQUIREMENTS - LAUNCH LOCATIONS o EVALUATE AND ASSESS ORBITAL TRANSFER MISSION MODES, INCLUDING DESIGN, LIFE, AND COST OF ELECTRICAL, CHEMICAL, AND NUCLEAR PROPULSION SYSTEMS C. DDT&E AND RECURRING COSTS o TOTAL DDT&E COSTS HAVE NOT BEEN DERIVED IN ANY DETAIL. ROUGH ESTIMATES RANGE FROM $30 TO $70 BILLION OVER 10- TO 20-YEAR PERIOD. PLANNED STUDIES WOULD TARGET FOR AN ESTIMATE WITH +20 PERCENT ACCURACY o PRESENT STUDIES INDICATE AS MUCH AS A FACTOR OF 3 TO 4 (30 TO 110 MILLS/KWH) SPREAD IN ESTIMATES OF THE COST OF COMMERCIAL POWER FROM SOLAR POWER SYSTEMS o SYSTEMS STUDIES AND OTHER ACTIVITIES SHOULD REDUCE THIS ESTIMATE SPREAD TO APPROXIMATELY 2 (30 TO 60, 50 TO 100) IN THE NEXT 2 YEARS Figure X-2.- System definition and exploratory technology phase activities.
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