1. Ground O&M staff 2. On-orbit maintenance/repair 3. Repa i r/replacement/maintenance 48 man-yr/yr/10-GW system 12 man-yr/yr I percent of SPS mass/yr (per sec. VII) DDT&E costs.- The DDT&E cost was based on development cost estimates for the major program elements. The estimates utilized are given in table XI-1. The estimates shown are the cumulative funding requirements from the start of technology advancement through system development (1995). The amortization of these costs over the initial 30 years of SPS operation per scenario B was accomplished using the equation shown at the bottom of figure XI-1. The numerator of the equation (total funding outlay) may include interest on capital expended during the 20-year development program. If a 9-percent interest charge is used, the effect is to increase the actual cost by a factor of about 1.4. However, as will be shown later, the DDT&E amortization cost is a small fraction of the cost of electricity. Cost summary.- Table XI-2 shows a summary of the cost estimates for the range of design parameters investigated. Note that the total COE ranges from 29 to 115 milIs/kWh. The COE for the "nominal" system is 50 to 59 mills/kWh, which consists of 46 to 52 milIs/kWh for capital recovery, 3 milIs/kWh (6 percent) for O&M, and 1 mil1/kWh (2 percent) for amortization of DDT&E. The capital recovery cost breaks down to about 45 percent for space transportation, 40 percent for satellite and construction, and 15 percent for the rectenna. In the highest cost combination (COE = 115 mills/ kWh), transportation costs increase to 60 to 70 percent. The satellite capital recovery is 25 to 30 percent and the rectenna only 8 to 10 percent. The SPS capital cost expressed in $/kW varies from a low of $1400/kW to a high of $5780/kW. This cost is the primary driver in establishing the cost of electricity for the SPS. This nominal cost system results from an overall SPS efficiency 2 of 5 percent, solar array weight of 0.4 kg/m , $300/kW for solar cell blankets, and a transportation cost from Earth to GEO of $108 to $164/kg. The construction location and satellite configuration are seen to have 1ittle effect on COE. Figure XI-2 illustrates the range of possible cost combinations for the SPS weight range investigated.
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