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<br />Power Operations [Cont.]
<br />
<br />Lower Basin
<br />
<br />Water Year 1989
<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 witb
<br />operating agents (The City of Los Angeles and its Department
<br />of Water and Power, and Southern California Edision
<br />Company, Ud,) expired, The "General Regulations for
<br />Generation and Sale of Power in Accordance with the
<br />Boulder Canyon Prnject Adjustment Act," promulgated on
<br />May 20, 1941, provided the basis for computation of charges
<br />for electrical energy generated at Hoover 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 Hoover Power plant and
<br />appurtenant works remained with Reclamation, Marketing
<br />of.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 />fuoction 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 (SCAD A) computer system located at their
<br />Phoenix District Office, The SCADA system 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. Routine maintenance was performed at Davis and
<br />Parker powerplants,
<br />
<br />The total energy delivered to the Hoover allottees during the
<br />1989 operating year (October I, 1988. to September 30, 1989)
<br />was 4,122,181,000 kWh, Of that amount, the Schedule A
<br />allottees received 3,426,837,000 kWh and the Schedule B
<br />allottees received 695,344,000 kWh, Schedule C allottees
<br />received no deliveries in the 1989 operating year,
<br />
<br />In water year 1989, six generating units (AI, AZ, A6, A 7, N2,
<br />and N5) at Hoover Powerplant were uprated, This increased
<br />the capacity by 180 MW, This brings the total plant capacity
<br />to 1,914 MW as of January 1990, Of the 17 generating units
<br />at Hoover Powerplant, 11 have been uprated,
<br />
<br />A $9,442,300 Reclamation contract was awarded to Marine
<br />Limited, Quebec, Canada. for the uprating of Units Nl, N2.
<br />N5, and N6, Work on Unit N6 began in September 1989 and
<br />
<br />is scheduled to be completed in February 1990, Five
<br />generating units at Hoover powerplant will remain to be
<br />uprated after Unit N6 is completed, Unit A8 is scheduled for
<br />October 1990, UnitA9 is scheduled for January 1991, UnitAJ
<br />is scheduled for May 1991, Unit N8 is scheduled for October
<br />1991, and Unit A4 is scheduled for January 1992, All uprating
<br />is sched uled to be com pleted by J uoe 1992. The total capacity
<br />at the completion of uprating is expected to be a maximum of
<br />2,074 MW,
<br />
<br />Principal work under the contract includes conducting a study
<br />of the existing generator design, furnishing and installing
<br />necessary new components, and modifying the generators, as
<br />required, to accomplish the proposed up rating. The objective
<br />is to uprate the generators by the optimum amount, based on
<br />water availability and economic feasibility, Studies show that
<br />sufficient water, head, and turbine capacity are available to
<br />produce significantly more generator output than the existing
<br />generator ratings will allow,
<br />
<br />At Davis and Parker powerplants acoustic flowmeters were
<br />installed on each unit. The data from these flowmeters will be
<br />used to calculate how many cubic feet of water is released per
<br />kilowatt generated, These improved data will help in better
<br />control for optimized operation and improved efficiency of
<br />the powerplants.
<br />
<br />Water Year 1990
<br />
<br />In operation studies of Lake Mead and Lake Powell for thc
<br />operating year which ends September 30, 1990, the amounts
<br />released at Hoover Dam have been projected to satisfy both
<br />downstream water requirements, including diversions by
<br />MWD and CAP, while also complying with the overall
<br />requirements to meet Compact, flood control, and operating
<br />criteria release provisions. The water scheduled to be
<br />released will generate Schedules A and B energy, The
<br />estimated monthly Hoover releases during water year 1990
<br />total 8.7 maf, It is estimated that generation from these
<br />Hoover releases will result in delivery to the approved
<br />contractors of approximately 4,0 billion kWh of electrical
<br />energy.
<br />
<br />Normal routine maintenance at Hoover Powerplant has been
<br />scheduled around the upratiog program outages, and upon
<br />completion of the uprating program in June of 1992,
<br />maintenance will return to a more normal schedule. The four
<br />main penstocks are scheduled for inspection and repair
<br />during the next 2 years,
<br />
<br />The Hoover Up rating Program was authorized by the
<br />Hoover Powerplant Act of 1984 (Act), which finalized a
<br />historic three-State agreement on the marketing of Hoover
<br />power after the original contracts terminated on May 31,1987,
<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 />
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