in the columns labelled "No Maintenance" in the tables are always the appropriate values. This ability to ignore the scheduled maintenance requirements of the SPS equipment on the ground can be obtained by providing a second, completely redundant, ground station for the SPS. It should be noted that the forced outage availability has not been changed. This implies that the level of redundancy has not been significantly increased. What has changed is the ability to shut one ground station completely down for maintenance while keeping the second station operating. The implication that there is a zero probability of any interruption of the power delivered to either ground station should also be noted. The values of n. in the columns labelled "Maintenance X Required" and "Eclipses" are determined as follows: during those intervals when the SPS is scheduled to be removed from the power for maintenance, the power pool would resemble a completely conventional power pool. The appropriate values of n. would be those given in the columns labelled "No SPS". When the SPS is not off-line for maintenance, the appropriate values of n0 are those in the columns labelled "No Maintenance". The maintenance of a single SPS in a power pool would be scheduled for intervals 4, 5 and 11 , (or 12), intervals during which the demand for power is near the minimum. The maintenance of each SPS in a power pool containing two SPSs would occur sequentially during intervals 3, 4 and 5 or 10, 11 and 12. Only one SPS would be off-line for scheduled maintenance at a time. Treating the periods
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