when the sun is eclipsed by the earth as if they were removals of the SPS from service for scheduled maintenance is the simplest way of calculating the amount of conventional generating capacity required in the power pool. The SPS is assumed to be unavailable for power generation during maintenance intervals 4, 5,11 and 12. (104 days.) When there are six SPSs in a power pool, only three would be unavailable at any one time because of scheduled maintenance. A separate set of n^'s was calculated for maintenance intervals, 3, 4, 5, 10, 11 and 12 for a power pool containing three SPSs. A. 3.3 Calculational Techniques - Composite Power Pool Calculating the required installed margin when the SPS is used to meet the load in two independent 30 GWe power pools whose times of peak demand differ by 3 hours is more complex than in the previous discussion. When there is no SPS in the composite power pool, each of the two 30 GWe power pools operate independently. The appropriate values for n$ in each of these power pools are the same as those contained in Table A.5. The times of peak demand for power in the two power consuming elements of the composite power pool are separated from each other by three hours. The variation in the power demand in the two pools with the time-of-day is shown in Figure 2.5. The output of the SPS at any particular time is fed to whichever of the two power pools has the highest demand for power at that time. Thus, for half of each day of the two power pools would operate as if it were a 30 GWe
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