SECTION 12 SYSTEM ANALYSIS AND EVALUATION The important factors in MPTS analysis are operating frequency, power level, cost, ground power density and efficiency. The efficiency can be evaluated in terms of its impact on SPS power source cost. Orbital transportation and assembly costs for both MPTS and SPS must be considered as well. Two cost measurements are used: capital cost per kilowatt which ignores interest, maintenance and return on investment charges; and energy cost in mills per kW hour which includes these costs for the projected lifetime of the station and for a utilization factor less than 100 percent. 12. 1 SYSTEM GEOMETRY
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