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<br />Power Operations [Cont.]
<br />
<br />LO\~r Basin
<br />
<br />Water Year 1991
<br />
<br />On June !, 1987, the United States assumed operation and
<br />maintenance responsibility of Hoover Powerplant and
<br />associated switching stations, after the 5O-year contract with
<br />operating agents (The City of Los Angeles and its Department
<br />of Water and Power, and Southern California Edison
<br />Company, Ltd.) expired. The "General Regulations for
<br />G cneration and Sale of Power in Accordance with the
<br />Boulder Can)<>n Project Adjustment Act", promulgated on
<br />May 20, 1941, provided the basis for computation of charges
<br />for electrical energy generated at Hoo",r Dam through May
<br />31, 1987, The Department of Energy Organizational Act of
<br />1977 transferred the responsibilily for Ihe power marketing
<br />and transmission functions of Ihe Boulder Can)<>n Project
<br />from the Bureau of Reclamation (Reclamation) to the
<br />Wcstcrn Area Power Administration (Western). The power
<br />marketing functions of Western include the rcsponsibility for
<br />promulgalingcharges for the sale ofpo'WCr. The construction,
<br />pO'Wet generation, operation, maintenance, and replacement
<br />responsibilities associated with Ihe H oo",r Powerplant and
<br />appurtenant works remained with Reclamation.
<br />
<br />Marketing of Parker-Davis power and operating the
<br />transmission system are the responsibility of Western.
<br />Reclamation continues to operate and maintain the dams and
<br />their pov",::rplants, a function of the Lower Colorado Dams
<br />Project Office.
<br />
<br />Davis and Parker Powerplants continue 10 be operated by
<br />remote control from Western's Supervisory Control and Data
<br />Acquisition (SCADA) computer s)Stem located at their
<br />Phoenix Area Office. The SCAD A s)Slem monitors and
<br />remotely conlrols the powerplant generating units to adhere
<br />to water schedules provided by Reclamation's water
<br />scheduling branch located at the Lower Colorado Dams
<br />Project, Hoover Dam. Routine maintenance was performed
<br />at Davis and Parker powerplants.
<br />
<br />The total cnergy dcli",red to the Hoo",r contractors during
<br />the 1991 fiscal year (October 1, 1990 through Scptember 30,
<br />1991) was 3,986,719,000 kilowatt-hours. Of Ihat amount, the
<br />Schedule A contractor recei",d 3,313,211,000 kilowatt-hours
<br />and Ihe Schedule B contraclor received 673,508,000
<br />kilowalt~hours. Schedule C contractor received no dclheries
<br />in Ihe 1991 operating year.
<br />
<br />In water year 1991, one generating unit, A9. at Hoover
<br />Powerplant was upraled. This increased the usabic capacity
<br />by 8.5 megawatts and brought the Iota I plant capacilyto 1952.5
<br />megawatts. Of the 17 generating units at Hoo",r powerplanl,
<br />13 have been upratcd,
<br />
<br />Four generating units remain to be up rat cd. Unit A8 is in the
<br />process of being uprated and is scheduled to be complcted in
<br />February, 1992. Unit A3 is in the process of being upralcd and
<br />is scheduled to be complctcd in May, 1992. Unit A4 is
<br />scheduled for completion in No",mbcr, 1992. Unit N8 is
<br />scheduled for completion in December, 1992. Thc total
<br />Hoo",r powerplant capacity, al the complelion of up rating, is
<br />estimated to be 8 maximum of 2,074 tnega'W3.tts. Principal
<br />work under the contract includes conducting a study of each
<br />existing generator's design, furnishing and installing necessary
<br />new components, and modifying the generators, as required,
<br />to accomplish Ihe proposed uprating. The, objecti", is to
<br />uprate the generators by the optimum amount, based on water
<br />availability and economic feasibility. Studies show that
<br />sufficient water, head, and turbine capacity afe available to
<br />produce significantly more generator output than the existing
<br />generator ratings willaliow.
<br />
<br />Water Year 1992
<br />
<br />In operation studies of Lake Mead and Lake Powell for the
<br />operating year which ends Scptcmber 30, 1992, the amounts
<br />released at Hoover Dam ha", been projected to satisfy both
<br />dOVr11stream water requirements, including dht:rsions byThe
<br />Metropolitan Water District and the Central Arizona Project,
<br />while also complying with the o",rali requirements to meet
<br />Compact, flood control, and operating criteria release
<br />provisions. The Vr'Bter scheduled to be released will generate
<br />Schedules A and B energy. The estimated monthiy Hoo",r
<br />releases during waler year 1992 total 8.96 million acre-feet. It
<br />is estimated that generation from these Hoo\-t:r releases will
<br />result in delivery to the approved contractors of
<br />approxlmately4.1 billion kilowatt-hours of eleclrical energy.
<br />
<br />Normal routine maintenance at Hoover Powerplant has been
<br />scheduled around the up rating program outages, and upon
<br />completion of the uprating program in December of 1992,
<br />maintenance will return to a more normal schedule. The four
<br />main penstocks are scheduled for inspection and repair
<br />during Ihe neltl 2 years.
<br />
<br />The Hoover UpratingProgram was authorized by the Hoover
<br />Powerplant Acl of 1984 (ACT), which finalized an historic
<br />three-State agreement on the marketing of Hoo..er power
<br />after the original contracts terminated on May 31, 1987. The
<br />Act also requires that the Hoover Uprating Program be
<br />undertaken wilh funds advanced by the non-Federal
<br />purchasers of Hoover power.
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