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<br />Power Operations [Cont.]
<br />
<br />Lower Basin
<br />
<br />Water Year 1990
<br />
<br />On June 1, 1987, the United States assumed operation and
<br />ma intenance responsibility of H cover Powerplant and
<br />associated switching stations, after the .5O-year contract with
<br />operating agents (The CityofLos Angeles and its Department
<br />of Water and Power, and Southern California Edison
<br />Company, Ltd.) expired. The "General Regulations for
<br />Generation and Sale of Power in Accordance with the
<br />Boulder Canyon 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 responsibility for the power marketing
<br />and transmission functions of the Boulder Canyon Project
<br />from the Bureau of Reclamation (Reclamation) to the
<br />Western Area Power Administration (Western). The power
<br />marketing functions of Western include the responsibility for
<br />promulgating charges for the sale of power . The construction,
<br />power generation. operation, maintenance, and replacement
<br />responsibilities associated with the H Dover POVr'Crplant and
<br />appurtenant works remained with Reclamation. Marketing
<br />ofParker-Da\is power and operating the transmission system
<br />are the responsibility of Western. Reclamation continues to
<br />operate and maintain the dams and their pO'Werplants, 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 SCADA system monitors and
<br />remotely controls 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, Hoo\ec Dam. Routine maintenance was performed
<br />at Davis and Parker powerplants.
<br />
<br />The totalenergydeli",red to the Hoo",r allotteesduringthe
<br />1990 operating year (October I, 1989 through September 30,
<br />1990) was 4,338,148,000 kilowatt-hours. Of that amount,the
<br />Schedule A allottees recei",d 3,604,457,000 kilowatt-hours
<br />and the Schedule B allottees reeeived 733,691,000
<br />kilowatt-hours. Sehedule C allottees recei",d no deli"'ries in
<br />the 1990 operating year.
<br />
<br />In" water year 1990, one generating unit, N6, at Hoover
<br />Powerplant was uprated. This increased the usable capacity
<br />by 30 megawatts and brought the total plant capacity to 1,944
<br />megawatts. Of the 17 generating units at Hoo",r Powerplant,
<br />12 ha", been uprated.
<br />
<br />Fi", generating units remain to be uprated. Units AS and A9
<br />are in the process of being up rated and are scheduled to be
<br />completed in March of 1991. Unit A3 is sebeduled for
<br />completion in December of 1991. Unit N8 has recently had
<br />
<br />the contract awarded and is scheduled for completion in April
<br />of 1992. Unit A4 is scheduled for completion in August of
<br />1992. All uprating is scheduled to be completed by August of
<br />1992. The total Hoover powerplant capability at the
<br />completion ofuptating is estimated to be a maximum of 2,074
<br />megawatts. Principal work under the contract includes
<br />conducting a study of the existing generator design, furnishing
<br />and installing necessary new components, and modifying the
<br />generators, as required, to accomplish the proposed uprating.
<br />The objecti", is to uprate the generators by the optiroum
<br />amount, based on water availability and economic feasibility.
<br />Studies show that sufficient 'Water, head, and turbine capacity
<br />arc available to produce significantly more generator output
<br />than the existing generator ratings will allow.
<br />
<br />At Davis and Parker powerplants acoustic flov.meters were
<br />installed on each unit. The data from these flowmeters will be
<br />used to calculate how many cubic feet of water are released
<br />per kilowatt generated. These irnpro",d data will help in
<br />better control for optimized operation and improved
<br />efficiency of the powerplants. At Parker Powerplant, the
<br />power transformers for Units 1.2, and 3 have been replaced
<br />and Unit 4 is in the process of being replaced. These
<br />replacements will impro~ the reliability of the resource and
<br />decrease transformed losses. This will in turn increase the
<br />customer"s usable energy.
<br />
<br />Water Vear 1991
<br />
<br />In operation studies of Lake Mead and Lake Powell for the
<br />operating year which ends September 30, 1991, the amounts
<br />released at Hoo",r Dam ha", been projected to satisfy both
<br />downstream water requirements, including diversions by The
<br />Metropolitan Water District and the Central Arizona Project,
<br />while also complying with the o",rall requirements to meet
<br />Compact, flood control, and operating criteria release
<br />provisions. The water scheduled to be released will generate
<br />Sehedules A and B energy. The estiroated monthly Hoo",r
<br />releases during water year 1991 total 8.8 million acre-feel. It
<br />is estimated that generation from these Hoover releases will
<br />result in delivery to the approved contractors of
<br />approximately4.0 billion kilowatt-hours of electrical energy.
<br />
<br />Normal routine maintenance at Hoover Powerplant has heen
<br />scheduled around the up rating program outages, and upon
<br />completion of the up rating program in August of 1992,
<br />maintenance \Irill return to a more normal schedule. The four
<br />main penstocks afe scheduled for inspection and repair
<br />during the ne><t2 years.
<br />
<br />The Hoover Uprating Program was authorized by the
<br />Hoo",r Powerplant Act of 1984 (Act), which fmalized a
<br />historic three-State agreement on the marketing of Hoover
<br />power after the original contracts termina ted on May 31, 1987.
<br />The Act also requires that the Hoo",r Uprating Program be
<br />undertaken with funds advanced by the non-Federal
<br />purchasers of Hoo",r power.
<br />
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