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<br />Power Operations [Cout.]
<br />Lower Basin
<br />
<br />Water Year 1988
<br />
<br />On June 1, 1987, the United States assumed operation and
<br />maintenance responsibility of Hoover Powerplant and
<br />associated switching stations, after the 50-year contract with
<br />operating agents (The City of Los Angeles and its Department
<br />of Water and Power, and Southern California Edision
<br />Company, Ltd.) expired.
<br />
<br />The "General Regulations for Generation and Sale of Power
<br />in Accordance with the Boulder Canyon Project Adjustment
<br />Act,' promulgated on May 20, 1941, provided the basis for
<br />computation of charges for electrical energy generated at
<br />Hoover Dam through May31, 1987. The Department of
<br />Energy Organizational Act of 1977 transferred the
<br />responsibility for the power marketing and transmission
<br />functions of the Boulder Canyon Project from the Bureau of
<br />Reclamation (Reclamation) to the Western Area Power
<br />Administration (Western). The power marketing functions
<br />of Western include the responsibility for promulgating
<br />charges for the sale of power. The construction, power
<br />generation, operation, maintenance, and replacement
<br />responsibilities associated with the Hoover Powerplant and
<br />appurtenant works remained with Reclamation. Marketing
<br />Parker-Davis power and operating the transmission 'system
<br />are the responsibility of Western. Reclamation continues to
<br />operate and maintain the dams and their powerplants, a
<br />function of the Lower Colorado Dams Project Office.
<br />
<br />Davis and Parker powerplants continue to be operated by
<br />remote control from Western's Supervisory Control and Data
<br />Acquisition (SCADA) computer system located at their
<br />Phoenix District Office. The SCADAsystem monitors and
<br />remotely controls the generating units to adhere to water
<br />schedules provided by Reclamation's water scheduling
<br />branch located at the Lower Colorado Dams Project, Hoover
<br />Dam.
<br />
<br />Along with normal scheduled electrical and hydroelectrical
<br />maintenance, the uprating of Hoover units AS, A 7, NI, N3,
<br />N4, and N7 from 100 megawatts (MW) to 130 MW, including
<br />the replacement of the associated power transformers and
<br />main bus work, was installed and placed in operation to bring
<br />the total installed capability as of January 1, 1989, to 1,619
<br />MW. Scheduled maintenance at Hoover Dam for water year
<br />1988 included normal replacements of stators, rotator
<br />components, piping, and transformers with associated bus
<br />work.
<br />
<br />The total gross energy generated at the Hoover PowerpIant
<br />during water year 1988 was.4,661,316,OOO kilowatt-hours.
<br />
<br />The Parker Powerplant generated gross energy of 531,267,428
<br />kilowatt-hours during water year 1988. Davis Powerplant
<br />generated gross energy of 1,160,280,000 kilowatt. hours during
<br />water year 1988.
<br />
<br />Water Year 1989
<br />
<br />In operation studies of Lake Mead and Lake Powell for the
<br />Hoover operating year, which ends September 30, 1989, the
<br />amounts released at Hoover Dam have been projected to
<br />satisfy both downstream water requirements, including
<br />diversions by MWD and CAP, while also complying with the
<br />overall requirements to meet Compact, flood control, and
<br />operating criteria release provisions. The water scheduled to
<br />be released will generate Schedules A and B energy and in
<br />some months excess energy. The estimated monthly Hoover
<br />releases during Water Year 1989 total 8.2 MAF. It is
<br />estimated that generation from these Hoover releases, along
<br />with the Hoover to Parker-Davis interchange, will result in
<br />delivery to the approved contractors of about 4.0 billion kWh
<br />of electrical energy.
<br />
<br />A $7,637,385 Reclamation contract was awarded for uprating
<br />generators N-3 and N-4 at Hoover Darn in Nevada to
<br />General Electric Company of Denver, Colorado. Work
<br />began in 1987 and was completed in 1988.
<br />
<br />Principal work under the contract included conducting a
<br />study of the existing generator design, furnishing and installing
<br />necessary new components, and modifying the two
<br />generators, as required to accomplish the proposed uprating.
<br />The objective was to uprate the generators by the optimum
<br />amount, based on water availability and economic feasibility.
<br />Studies show that sufficient water, head, and turbine capacity
<br />are available to produce significantly more generator output
<br />than the existing generator ratings will allow. The original
<br />generators were manufactured and installed by
<br />Westinghouse. Generator. N-3 was installed in 1937 and
<br />generator N-4 in 1936.
<br />
<br />An additional $10,620,722 contract has been awarded, also to
<br />the General Electric Company of Denver, Colorado, to
<br />uprate generating units AI, A2, A6, and A 7 at Hoover Dam
<br />in Arizona. After starting work on those units, the contractor
<br />will,have 2 years to complete the job. Upon completion of this
<br />contract, eight of the 17 generating units in the powerplant will
<br />have been uprated. Work on A 7 was completed in October,
<br />1988 and A6 is scheduled to be completed in February, 1989.
<br />
<br />The Hoover Uprating Program was authorized by the
<br />Hoover Powerp1ant Act of 1984 (Act), which fmalized a
<br />historic three-State agreement on the marketing of Hoover
<br />power after the original contracts terminated on May31, 1987.
<br />The Act also requires that the Hoover Uprating Program be
<br />undertaken with funds advanced by the non-Federal
<br />purchasers of Hoover power.
<br />
<br />Scheduled for completion in 1992, the Hoover Uprating
<br />Program will be funded with an estimated $126 million from
<br />non-Federal sources in Arizona, California, and Nevada.
<br />,Arizona and Nevada will each fund about 37 percent of the
<br />costs, with the remainder being financed by nine
<br />municipalities in southern California.
<br />
<br />The Hoover Uprating Program will result in a generation
<br />increase to an anticipated output exceeding 2,000 megawatts.
<br />
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