SPS. For example: If a power pool, which has a peak power demand of 50 GWe contains no SPS, only 10 to 11 GWe of installed margin (60 to 61 GWe total) are required to provide for system reliability. If this same power pool contains an SPS which must be shut down for scheduled maintenance, 12 to 13 GWe of installed margin are required. The power pool which contains an SPS needing scheduled maintenance requires two more gigawatts of generating capacity than does the power pool that contains no SPS. If the SPS needs no scheduled maintenance, only one more gigawatt of generating capacity would probably be needed (11- 12 GWe minus 10-11 GWe). The results shown in Table 1.1 indicate that if one or more 5 GWe generators (SPS, nuclear or fossil fuel) are installed in a power pool, the installed generating margin must be increased if the system reliability is to be maintained. The percentage increase would depend on the size of the power pool; the larger the power pool, the smaller the required percentage increase. To demonstrate how the installed margin must vary with the power pool size, the percentage installed margin is plotted as a function of the power pool size in Figures 1.1, 1.2 and 1.3. * The 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. The additional generating capacity that the results of this study indicate will be required need not be expensive. The extra capacity will not be used very often and could be in the form if inexpensive peaking units ($125/kW), causing an increased capital require- ** ment of $250 million, 3.3% of the cost of the SPS ($7.6 billion) and Two independent 30 GWe Power Pools whose times of peak demand differ by three 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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