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<br />~zco <br /> <br />OPERATION .\NU .\[,\INTENANCE <br /> <br />"''''.'' <br />19 <br /> <br />Firm energy rates alld secondary energy rates at Hoover Dam <br />are determined in order to produce revenue sufficient for an costs <br />of operation. maintenance, replacementg, and amortization, and. for <br />payments to Arizona and Nevada, and to the Colorado River De- <br />velopment Fund. Variations in costs are reflected in the rates as <br />shown in the following table. <br /> <br />I <br />I <br />I <br />'I <br /> <br />OI'EIl."-l'I~C <br />Y~.A[l <br />]931-19:\8 .................. .................. <br />19J8.EJ:i9 ............... ,_............,..... <br />1939-]9-11) ............. ..... .................. <br />1940.]941 ................................... <br />1941.}1)42 ... ........ .................. <br />1942.194:1 .. ................... <br />19HI9.14 .. .... . .... . . ........ .... .... <br />1944-19,IS ......... _...... ................... <br />1945-1946 ................ .... .......... <br />1946.1941.................................... <br /> <br />1947-19.~R .................................... <br />1948.1919........ ......... <br />19.~9.19S0 .. _,........ ........_ _... _... <br />19S0-]9S1............ ................. <br />19.51-]952 .............. .,............ <br />]952.1953 .. .......................... <br /> <br />HAT~. J.\' I\f]LL~ <br />PER KWHIl <br />FIRM SECO."[,^ltY <br /> <br />.1 <br /> <br />1.1';3 0.340 <br />1.16.1 0.340 <br />1.163 0.340 <br />1.16.1 0.340. <br />Ll63 0.3'10 <br />1.172 0.34.6 <br />1.19D 0..3.17 <br />1.254- 0.398 <br />1.244 0..192 <br />1.220 0..370 <br />1.277 O.41.3 <br />1.343 0.455 <br />1.29f\ O.4~tl <br />1.314 0.4.1'; <br />L]]3 0.436 <br />L328 OMS <br /> <br />At the beginning of operatio"s under the District-Edison Trans- <br />mission Line Contract af 1945, the Southern California Edison <br />Company instal1ed at Camino switching station a 230-kv oil circuit <br />breaker in the Gene branch of the 230-kv line. The breaker has <br />been used many times to isolate the Camino-Gene branch of the <br />230-kv line for repair and maintenance work. However, the increas- <br />ing importance of operations between the District and U!li!~tates <br />----systems-has-ilf<1icatecnne aovisa15ility of-pjaclrig a breaker in the <br />230-kv Gene-Parker tie-line. Accordingly, the 2:30-kv breaker at <br />Camino was moved to Gene pumping plant, and placed in operatioll <br />there on April 14. 1952. <br />Generation and delivery of energy from Haavel' power plant <br />involves the interchange of energy from Parker and Da\'is power <br />plants with energy al10cated to the District. In the process of inter- <br />changing energy, the United States delivers Parker energy to the <br />District ill lieu of Hoovel' enel-gy. Storage of water in Lake Mead <br />is thus increased. The ,vater is then lIsed fOI" generation of energy <br />to be returned to the United States. However, the rate of return <br />has been low, due to an abundallce of Davis energy and consequently <br />the storage in Lake Mead has been increasing until in January 1952 <br />it represented "bout 121 million kilowatthours. <br />