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 milIs/kWh, which consists of 46 to 52 milIs/kWh for capital recovery, 3 mills/kWh (6 percent) for 0&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 little effect on COE. Figure XI-2 illustrates the range of possible cost combinations for the SPS weight range investigated. C. Comparison With Conventional and Other Advanced Systems The economic viability of SPS will be dependent upon the costs and economics of alternative conventional and other future power systems. Figure'XI-3 shows a summary of typical power-generation costs for baseload conventional systems and several advanced concepts receiving research and development interest (and funding) at this time. The range of costs shown for each of the conventional systems corresponds to sitespecific variations such as local environmental constraints, local labor and materials costs, land and site preparation costs, and fuel cost varia- The cost of coal-fired plants varies greatly depending upon the degree of stack gas scrubbing required and the type of cleanup system utilized. The conventional nuclear systems shown are light water reactors (pressurized water and boiling water). It is expected that the fast breeder reactor (liquid metal cooled) will have a capital cost in the $800 to $900/kW range. The highest cost conventional systems are coal and nuclear, which are becoming the major electrical power sources for the last quarter of this century. As with SPS, the other advanced power systems shown generally have higher capital costs ($/kW) than the conventional systems, but have zero-to- minimal fuel costs. The technical and economic feasibility of these systems is currently being investigated by ERDA and others. Although not shown in figure XI-3, nuclear fusion is another advanced power-generation system that
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