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Power Operations [Cont.] ~I .'__~lj - -. .i.J~.~ ~ ~~ . .'1" ..:~;~;~~~ . '4 :~t'~_.~...~....; :::.:~.~~. -- .', . 'I,.. . .. _~'_"7::)~""';'::' !:'J.P.........~ '," l1?~;..o'-~';:l~r..,... .~. .~; -- Power Ime hook.up on 0 110.foollower. Lower Basin - Water Year 1984 The total energy delivery to the Hoover allottees during the 1984 operating year (June 1. 1983 - May 31. 1984) was 10.396.977.387 kilowatt-hours (kWh). Of that amount, 6,469,937.387 kWh was secondary energy in excess of contract defined firm energy. The remote cont(ol operation of Davis and Parker Powerplants which first began during water year 1982 continued without event. These generator units are computer operated from the Department of Energy's Phoenix Dispatch Office, using hourly ga~e opening arid -megawatt sct1edules in-put and modified by Reclomation's Water Scheduling Bronch in Boulder City. Nevada. Scheduled maintenance at Hoover Dam wos accomplished for water year 1984. A new self.contained, three.phase transformer was installed on Unit A-5. This installation required considerable cooling water piping and valve changes, as well as the electrical work, and was completed near the end of June 1984. Overoll maintenance on the unit was performed during this outage. This 135 MVA tra(1sformer was delivered to Hoover Dam on a 13.axle truck rig and lowered to the tronsformer deck by cable. The delivery naturally slowed traffic and 30 p~~~c_~~____ ~-----.:- . ~?~-~-=--------_.- -------. -::-.:.::-~--;:::~:::-:-~- .~--..--- -------:..:.-~ - %:;1'z:_-i::;'i2Z-~'~i~~j~#~' -"~\ ~ , 3"'---e:7-M'C?.'H'~:;"-:~1~ r . ... ""..- , ~L.~~~i~:ci:- ,~l{~~~~"}X~<'h:t~~ <?fi:'~ - ~-~-r "~:;~~:,::;,~~::/;' Concl lining reduces seepage losses. the overall operation generated a great deal of interest for visitors, employees, and their families, Scheduled maintenance ot Davis and Parker Powerplants .wos deferred during water year 1984 because of the high base flows. Water Year 1985 In operation studies of lake Mead and Lake Powell for the Hoover operating year, which ends May 31. 1985, the amoLlnts released at Hoover Dam have been projected to satisfy both downstream water requirements, including diversions by. MWD. while also complying with the overall requirements to meet compact, flood control, and operating criteria release provisions. The water scheduled to be released will generate 100 percent of contract defir1ed firm energy, plus secondary energy. The estimated monthly Hoover releases during the operating year total 17.8 million acre.feet. It is estimated that generation from these Hoover releases, alol1g with the Hoover to Parker. Da....is in'erchange, will result in delivery to the allottees of about 8.S billion kWh of electrical energy, Scheduled outage of the Hoover Upper Arizona penstock for major unit and intake gate maintenance in February 1985 has been cancelled. Precipitation in the Upper Basin has a....eraged about 200 percent of normal since June 1984. Increased precipitation since that time may fur1her revise expected release figures of 19,OCXJ to 28,000 cfs during January and February 1985. The ongoing schedule of replacing high pressure cooling water piping and valves at Hoo....er is being performed, os well O!l major repairs to the needle val'l/es and paradox gates in the Canyon Wall Outlet Works and Tunnel Plug Outlet Works. Each of the four Parker Pawerplant units in turn were out of service for cable replacement. Annual maintenance was performed on the individual unit during the outages, With this maintenance accomplished, there are no scheduled outages at Parker to be affected by water releases. The Davis Powerplant annual maintenance schedule is proceeding as planned. Short- term outages are forecast for wicket gate repairs 0(1 Davis G.2 and exciter overhaul on Unit G.4.