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<br />27.
<br />
<br />,
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<br />
<br />a comparison of the value of falling water for primary
<br />
<br />energy.
<br />
<br />, For this purpose I have assumed a maximum of
<br />
<br />4,277,000,000 kw-hrs. per year at Boulder and an average
<br />of 4,080,000,000 kw-hrs. of primary energy per year,
<br />equivalent to 3,774,000,000 kw-hrs. delivered at Los An-
<br />geles, allowing for 71% transmission losses. This energy
<br />would require a maximum peak of 987,500 kw. at Boulder Dam
<br />and a peak of 913,437 kw. at Los Angeles with 7i% lose.
<br />The number of generating units at Boulder required during
<br />periods of low water at 66,000 kw. per unit would be 16
<br />units, 15 active units plue 1 spare. During periods of
<br />high water, at 82,500 kw. per unit, there would be required
<br />13 units, 12 units plus one spare, for generating primary
<br />energy alone, the remaining units being available for
<br />generating s~condary energy. Based upon a delivered
<br />capacity of 120,000 kw. per circuit, 71 circuits would be
<br />
<br />required to deliver the maximum capacity. However, as a
<br />
<br />practic~l situation one group of 3 circuits will handle
<br />
<br />390,000 kw. and 2 groups of 2 circuits each will handle
<br />
<br />480,000 kw., or n total of 870,000 kW., thorefore, 7 eir-
<br />
<br />cuits were used in my study.
<br />As has be~n previously discussed, I have used
<br />
<br />240,000 kw. of steam standby, which, in my opinion, is
<br />the very minimum for reliability of transmission for the
<br />
<br />A. B. Roberts
<br />
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