X. PROGRAM DEVELOPMENT PLAN A. Program Phasing The SPS program plan has been divided into four phases as illustrated in figure X-l. The four phases include an initial phase of system definition and exploratory technology followed by a technology advancement phase. These two phases would provide the information required to make a decision in the 1987 time period to proceed with full-scale development of the system. Assuming a positive decision at this time, an initial system might be in operation in the 1995 time period. The subsequent and final phase would be one of commercialization involving multiple SPS's such as identified in the various scenarios described in section III. B. System Definition and Exploratory Technology Phase This immediate phase would include improved definition and assessment of satellite power system concepts; transportation, construction, and operational support systems; design, development, test and evaluation (DDT&E), and recurring costs and environmental impact. A further description of activities in these four areas is presented in figure X-2. Figure X-l.- Space solar power projected program phasing.
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