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<br />A new approach is being evaluated for geothermal development. In <br />the past, the Service has maximized water production with energy being <br />secondary. The geothermal fluid was desalted with the limiting factor <br />being the reservoir recharge. The new approach is to match a thermal <br />powerplant to the reservoir's recharge and use the steam produced for <br />product water and a portion of the powerplant blowdown as cooling <br />water. The desalting plant is eliminated. The result is more energy <br />production with nearly the same quantity of water produced. This <br />process would appear to greatly reduce. water production costs and <br />produce an economi ca 1 source of energy. Potenti a 1 geothermal areas <br />are being reevaluated under this concept. <br />Solar/Hydro Integration Study. This is a study of integration of a <br />100-MW so 1 ar powerp 1 ant to be constructed either near Yuma or in <br />Southern Nevada with the Federal hydroelectric system. The report is <br />under final review. <br /> <br />FEASIBILITY INVESTIGATIONS <br /> <br />Hoover Powerplant Modification, Arizona-Nevada. A draft report has <br />been completed and i.s being reviewe.d in the Regional Office. The <br />preferred plan would involve construction of a 500-MW addition in a <br />new surface powerhouse located in the vi ci ni ty of the exi st i ng <br />structures. The present rated capacity of the 17 Hoover generators is <br />1,344 MW. The ongoing uprating program will increase this to 1,800 MW <br />and the 500-MW addition would bring the total capacity to 2,300 MW. <br /> <br />Colorado River Salinit Control Pro'ect Title II LaVerkin S rin s <br />n1 t. IS proJec wou remove a au ,ons 0 sa t annually <br />from the Colorado River System. A locally acceptable project plan was <br />deve loped uti 1 i zi ng a reverse osmos is desa 1 ti n9 plant. However, the <br />proposal was found to be not cost effective primarily due to the high <br />cost of brine evaporation ponds. Deep well injection of brine may be <br />less costly and is being examined as an alternative prior to <br />preparation of a final report on the project. <br /> <br />CONSTRUCnON <br /> <br />Central Arizona Pro'ect Arizona. Construction of the Central Arizona <br />rOJec s 1S con-1nu1ng essen 1ally on schedule. The Lake Havasu <br />Pumping Plant is about 50 percent complete. The 6.8 Buckskin Mountain <br />Tunnel and 97 miles of the Granite Reef Aqueduct are complete. In <br />addition, contracts have been awarded for 38.5 miles of the Aqueduct <br />leaving 78.3 miles yet to be contracted. The Granite Reef Aqueduct <br />will. convey water from Lake Havasu to Phoenix. <br /> <br />Centra 1 Ari zona Water Control Stud. The Centra 1 Ari zona Water <br />on ro u y 1 sa. cooperative study wi th the Corps of <br />Engi neers to i dent ify sui tab 1 ea 1 ternati ves toOrme Dam and Reservoi r <br />that would provide flood control and Central Arizona Project. (CAP) <br />regulatory storage capacity. The first major step in the study has <br />recently been completed and presented i nthe Pl an of Study, January <br />1980. This step entailed the identification and initial study of the <br /> <br />C-60 <br />