FIGURE 3.5 SUPPLY & DEMAND FOR POWER FROM DEMONSTRATION SPS SATELLITE supply will last (for example, at demand rates of 15, 10, 5 and 1 MW/yr, the demonstration satellite power supply will last 12, 20, 33 and 96 years respectively). It was assumed for the analyses reported in the following paragraphs that the demonstration satellite would have a maximum life of 30 years for being able to remove portions of the power supply. The salvage value of the demonstration satellite when used as a source of power and other major subsystems for other space activities is summarized in Figure 3.6 and discussed below. The salvage value, SV, is SV = PV1 - PV2 - PV3 - PV4 - PV5 where PV1 is the present value of the non-SPS mission investment costs that may be foregone because of the utilization of the SPS demonstration satellite hardware. The costs that may be foregone include both the space hardware costs and the
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