reconsidered only if the daily load curves begin to flatten significantly. 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, the maintenance requirements of the ground rectenna stations will have little effect on the installed margin. The margin's insensitivity to the eclipse comes from the size of the required margin when the pool contains no SPS and the uncertainties of the calculation. 2.3.2 Formulation of the Problem 2.3.2.1 Definitions The demand for electric power in any particular power pool varies during each day and the daily peak varies during the year. Each power pool is designed to have enough individually reliable generating units so that there is a high probability of having enough generating capacity on-line at any one time to meet the demand when it occurs. The probability of meeting the load at any time is the probability that the available generating capacity exceeds the probable demand for power. The probability of not meeting the load (the ''Loss of Load Probability” or LOLP) is therefore the difference between unity and the probability of meeting the load. The design LOLP for most U.S. power pools is 1 day in 10 years. Since all equipment has some probability of breaking down and needing repair, it is necessary to install more generating capacity than the expected peak demand. The total generating capacity in a power pool minus the peak demand is called the installed margin. Another way of stating the LOLP criterion is that the reserve margin shall be greater than or equal to zero except for .1 days/year.
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