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<br />c <br /> <br />(...,) <br />~ <br />en <br />"'"'" <br />(Xl <br /> <br />'would be to divide the load into a baseload and peaking load. FIGURE 3 <br /> <br />shows a typical week.ly load curve showing the daily peaks and valleys and <br /> <br />a typical base load generation pattern superimposed on the load curve. The <br /> <br />beseload is greater than the minimum demand (valleys) but not as great as <br /> <br />the maximum demand (peaks). Peak demands are met from other sources, such <br /> <br />as peaking power plants, or facilities that arc operated only during those. <br /> <br />periods of time. In this way the baseload plant runs continually at high <br /> <br />efficiency, and the peaking plant runs when needed to meet demand at peak <br /> <br />times. Further breakdowns into base, intermediate, and peaking loads can <br /> <br />further increase the efficiency of the overall system, Excess capacity in <br /> <br />the baseloed and intermediate' plants may be sold as "interruptible" power, <br /> <br />Interrupti,ble means that tbe purchaser agrees tbat the power may be trans~ <br /> <br />ferred to other users during peak demand pedods. <br /> <br />Peaking power can be produced in several ~lays. Often older, 10\01 <br /> <br />efficiency coal~fired steam plants are used. These plants conSUDle a great <br /> <br />deal of energy and are slow in startup, but they alQo save the large capital <br /> <br /> <br />costs of new plant constrUction. A second popular solution is oil-fired <br /> <br />combustion turbines. These turbines have the advantages of fairly high <br /> <br />efficiency and quick startup, but oil is becoming scarce and is increasingly <br /> <br />expensive. 'The third common peaking source is hydroelectric power, and pos- <br /> <br />sible development of this resource is the focus of. this study. "Hydro <br /> <br />peaking," as it is called, can be supplied either by conventional hydro or <br /> <br />by pumped storage. Either method is well suited for peaking operations. <br /> <br />FIGURE 4 shows a conventional hydro which uses a typical dam_reservoir <br /> <br />system with releases made during peak periods. These plants have the <br /> <br />3 <br />