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<br />10 <br /> <br /> <br />. :~'" ' ,'" <br />, t .\)~) <br /> <br />The earlier power studies indicated that of the 505 <br />million kilowatt-hours generated annually, 400 million would be <br />firm energy and 105 million would be nonfirm. However, these <br />evaluations did not include advantages available through integra- <br />tion with adjacent power systems. <br /> <br />Project power facilities tvill be interconnected t1ith the <br />western division, Missouri River Basin, and other adjacent utility <br />systems, thereby proViding for energy interchange. Combining <br />advantages gained by system interconnection with the other modifi- <br />cations of the plan permits more flexible year around operations, <br />resulting in,increased production of firm energy. <br /> <br />An analysis by months for the 47-year period, 1911-1957, <br />shows that project storage is adequate to permit power releases <br />as required by load characteristics. Sufficient plant capacity <br />and forebay and afterbay storage are planned to provide a high <br />degree of flexibility and a dependable capacity of 100,200 kilo- <br />watts over the entire period of study. With this operating <br />flexibility, available capacity and interconnection with other <br />systems, excess energy available during periods of above average <br />water supply can be exchanged for equal but relativeJy small <br />amounts of energy required in periods of below average water <br />suppJy so as to maintain firm energy at 507.2 million kilowatt- <br />hours each year. The exhibit on the next page graphicalJy shows <br />monthJy generation for the 47-year period of study and the amounts <br />of energy interchange necessary to maintain a firm annual power <br />supply of 507.2 million kilowatt-hours. <br /> <br />To further test the adequacy of plant capacity and pondage <br />in the project facilities to meet load requirements, an hourJy <br />study was made for a typical peak week during August and a typical <br />peak week during December. It -was found that instead of operating <br />the Elbert Powerplant only in the winter months as previously <br />planned it would be necessary to operate throughout the year to meet <br />the required peaks. Sugar Loaf and Twin Lakes Reservoirs have suffi- <br />cient capacity and flexibility to do this. The hourly studies also <br />revealed that increased pondage capacity in the power canal system <br />would be required to provide sufficient flexibility for weekJy and <br />dally operation. The increased capacities have been incorporated <br />in the project facilities with corresponding increases in the cost <br />