roughly $50 million/year for fuel. If a completely redundant antenna were built to eliminate the need for scheduled maintenance, the total cost increase (including 1 GW of gas turbines) would be $1.47 billion, 19% of the cost of the SPS. An additional conclusion was reached while actually performing the calculations; if the SPS is shut down by the earth eclipses for only the duration of the eclipse, the eclipses will have no effect on the system reliability. 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 required 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 had no effect on the system LOLP and should be considered further only if it is expected that the daily load curve was tending to become flat. The composite power pool was found to be unaffected by either the SPS maintenance requirements or problems due to the eclipse. Because the power produced by satellite in this power pool could be used in some way or other throughout the year, it is understandable that the maintenance requirements of the ground stations would have little effect on the installed margin. The margin's insensitivity to the eclipse stems from the large size of the required margin when the pool contains no SPS and the uncertainties in the calculation. 1.3 Possible Ownership of the SPS Three different ownership and/or energy pricing arrangements for the SPS have been investigated. These arrangements were: • Purchase of the SPS by a utility or consortium of utilities.
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