Figure XI-9.- Land area requirements for 5-GW plant. 6. The assumptions used in the "nominal" cases (50 to 60 mills/ kWh) are worthy of mention because they represent a set of assumptions that are believed to be attainable and do not represent any extreme breakthroughs in technology. For instance, the silicon solar cell for this nominal design case was 10.4 percent efficient at the operating temperature of 100° C. The cost of the array was $300/kW (ERDA goals: $500/kW in 1985 and $100 to $300/kW in the year 2000)1 and the basic cell was 4 mils thick. The total system end- to-end efficiency was 5.4 percent, which represented a total satellite weight of 84 000 metric tons. The transportation cost used was $164/kg to GEO compared to the projected current Shuttle cost of $550/kg to LEO.
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