these materials would be about $67 million. It is likely, however, that the cost of removing the concrete for recovery of the land would be approximately equal to the net value of the steel and aluminum. Thus the principal salvage value of the rectennae is likely to be the present value of the land referenced to the initial * operation date of the system. This is approximately $33 million at a land value of about $1,000 per acre. A more valuable salvage use of the rectennae would be their reuse with new SPS satellites. In this case, especially if existing concrete footings and other components are reusable, the salvage value of the rectennae could approach 30 percent of their new cost. Since the rectennae cost represents about 26 percent of the total SPS cost of about $13.9 billion, this value could approach $1.1 billion. If only land and the rectenna support structures are salvageable, the salvage value is about $620 million. This lower number allows substantial evolution to occur in the rectenna technology. Finally, those items which are not salvaged must be disposed of. The disposal options considered and their respective costs are given in Table 1.3. Five disposal options are considered. Disposal to or Ly the stable (equilateral) libration points in the earth-moon system would provide a location where the satellites might be recovered at some point in the distant future and salvaged for some, presently unknown, use. No stationkeeping or control of the satellites would be necessary once they are in this orbit. The second disposal option presented is to boost the satellite to an orbit above GEO. Twice GEO is presented arbitrarily. The AV required is obviously a function of how high the satellite is boosted and the value provided is nominal. This orbit could utlimately require some stationkeeping * Corresponds to WBS item 1.4.1.1.1 in the Rockwell International cost estimate.
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