★ plotted values for the composite power pool clearly indicate that the composite power pool cannot be treated as if it were a 60 GWe power pool. For the power pools considered in this study, the smallest increase in the generating margin was 1 GWe for every 5 GWe SPS (no scheduled maintenance) installed. This means that if an SPS is installed instead of 5 GWes of conventional bascload capacity, 1 GWe of reserve capacity (probably gas turbines) must also be installed. When scheduled maintenance was required, the increase in the generating margin became 2 GWe for every 5 GWe SPS installed. The additional generating capacity that this study indicates will be required need not be expensive. The extra capacity will not be used very often and will probably be inexpensive peaking units ($125/kW), requiring capital of $250 million, 3.3% of the cost it it of the SPS ($7.6 billion). If a completely redundant antenna were built, the total cost increase (including 1 GW of gas turbines) would be $1.47 billion, 19% of the SPS cost. The analysis above revealed that the eclipses will have no effect on the system reliability if the SPS is shut down by the earth eclipses only for the duration of the eclipse. The demand for power during these eclipse periods was only half the daily peak and the probability that other generation would not be available to supply the needed power was virtually zero. If the shutdown were to last from one hour before the eclipse to one hour after the eclipse, the results would be the same. This particular problem should be Two 30 GWe power pools whose times of daily peak demand differ by 3 hours. "Space-Based Solar Power Conversion and Delivery Systems Study - Interim Summary Report", by ECON, Inc., March 1976, Report No. 76-145-IB.
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