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<br />.. <br /> <br />" <br /> <br />With regard to Hoover Dam power plant, the present <br />generating capacity is about 1,644 megawatts. Beginning on <br />June 1, 19B7 generating capacity will be reduced to about <br />1,544 megawatts and will vary continuously dur ing the <br />remainder of the uprating program. It will range from a low <br />of about 1,313 megawBtts from December 19B9 to February 1990 <br />to a high of 2,039 megawatts upon completion of the program <br />in October 1992. Power plant flow capacity during this <br />period will probably range from about 31,000 cfs to 34,000 <br />cfs. <br /> <br />The uprated eight-generating unit Glen Canyon Dam power <br />plant has a flow capacity of about 33,100 cfs. The schedule <br />for normal maintenance for the Glen Canyon generating units <br />is January through April with one generating unit generally <br />being off line continuously during this time. This results <br />in a power plant flow capacity reduction of 4,000 cfs, for a <br />total flow capacity of 29,100 cfs during this period. A <br />summary of the monthly flow capacities for the power plants <br />on the mainstem of the river, under normal maintenance <br />schedules, is presented in Table 3. <br /> <br />During the peak energy demand periods, the hydroelectric <br />generation is most valuable to the power customers since it <br />can be used to replace high-period thermal peaking units. If <br />the plants are block-loaded, meaning all units on line at <br />full capacity, due to flood control releases, on and off peak <br />shaping of hydroelectric generation is not possible. By <br />scheduling the water release earlier in the year, these <br />block-loading situations can be reduced. The limitations on <br />var iations in water releases are factors that must be <br />considered when scheduling onpeakjoffpeak operations. <br /> <br />From a hydropower generation revenue perspective, <br />neither the spring nor fall are highly desirable periods to <br />release excess water. Inspection of Table 4, which shows the <br />relative monthly values of energy based on fuel conservation <br />sales rates, indicates that greater power values would be <br />derived by redistributing spring and fall water releases <br />mandated by the flood control regulations to the summer <br />months. <br /> <br />-17- <br />