The results of the analysis are illustrated in Figure 3.4 where the present value of the demonstration satellite is indicated as a function of transportation cost ($/kg) and the time interval between the initial operations dates of the full- scale operational satellite and the demonstration satellite. The basic conclusion that may be reached from the data presented in Figure 3.4 is that the salvage value ($1.1-$ 1.7 billion) of the demonstration satellite may be a large percentage of the demonstration satellite on-orbit cost (first unit plus transportation cost). The salvage value may be in the range of 60-90 percent of the on-orbit cost of the demonstration satellite depending upon transportation cost achieved and the time interval from demonstration satellite operations to operation of the first full-scale SPS satellite. 3.2 Demonstration Satellite Use as a Power Supply for Non-SPS Space Activities If the demonstration satellite is not utilized as an initial element of a full- scale operational SPS satellite, it may serve as a source of power (335 MW) and major subsystems for other space activities. When used in this manner its value is a function of the demand for space power and other major subsystems and the timing of this demand. The value of the demonstration satellite when used as a power supply for non-SPS space activities is the value of the power supplies and Percent power degradation (due to both random nonreplaced failures and radiation effects) of SPS power supply per year (%/year) Cost per kilowatt for interfacing operational SPS satellite power modules with other operational SPS satellite power modules ($/kW) Percent increase in cost of interfacing operational SPS power modules with demonstration satellite power modules (%)
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