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<br />11. Enhancement of entire system generating efficiency. Pumped <br />storage can reduce the usage of inefficient thermal pl ants. With <br />pumped storage in pl ace in a system, highly efficient baseload pl ants <br />can operate at a higher load factor, thus improving the overall system <br />efficiency. Pumped storage can further enhance and extend the life of <br />steilll plants by allowing them to operate at a fixed point. Thermal <br />transients, which are the greatest cause for reduction in pl ant 1 ife, <br />can be greatly reduced by using pumped storage. <br /> <br />12. Reduces the use of gas turbines and displ aces high-cost, oil- <br />fired units. <br /> <br />13. Helps with system maintenance schedul ing. pumped storage pl ants <br />generally have large units which can fill in for other units in the <br />system during scheduled maintenance. <br /> <br />SpecifiC Advantages of the Diamond Fork Power System <br /> <br />The Fifth Water Pumped Storage Powerpl ant is not a pure pumped storage <br />plant. An average volume of approximately 200,000 acre-feet of water will <br />flow through the system each year as a result of the transbasin diversion. <br />This flow through component is a renewable resource that will signifi- <br />cantly reduce the iIllount of pumpback energy required to operate the pumped <br />storage plant, especially during the summer months since about one-half of <br />water deliveries for the Central Utah Project must be made during these <br />months. <br /> <br />Comparison with other recently-constructed pumped storage systems indicates <br />that the Fifth Water Plant will have excellent generation load following <br />abil ity. The ratio of Tw, water starting time, to Tm, machine starting <br />time, is indicative of good response when the ratio is less than 0.24. <br />Likewise, a gate time constant, Tg, less than 25 also indicates good <br />response. As shown in Table 7, the Fifth Water Pumped Storage Powerplant <br />machinery is well below these criteri a. <br /> <br />Table 7 <br />Time Constant Comparisons for Various Pumped Storage Powerplants <br /> <br />Pl ant NiIlle <br /> <br />Mt. El bert <br />Dr akensburg <br />Bijina Basta <br />Dinorwic <br />Helms <br />Fifth Water <br /> <br />Head (FT) <br /> <br />400 <br />1,525 <br />1,969 <br />1,774 <br />1,763 <br />1,475 <br /> <br />Tw/Tm <br /> <br />.I9. <br />80.3 <br />51.2 <br />18.6 <br />10.6 <br />12.3 to 18.3 <br /> <br />0.339 <br />0.292 <br />0.215 <br />0.192 <br />0.132 <br />0.08 to 0.11 <br /> <br />A great deal of baseload generation capacity exists within the Intermountain <br />area. Di amond Fork could help these highly efficient steam pl ants operate <br />at a higher plant factor and thus improve the overall system efficiency. <br />These pl ants may be an ideal source of pumping energy for operation of <br />Fifth Water Pumped Storage Powerpl ant. <br /> <br />As mentioned previouslY. Reclamation anticioates that the Diamond Fork <br />Power System Final Environmental Statement will be filed with the EPA <br /> <br />32 <br />