Laserfiche WebLink
<br />w <br />en In the unlikely event that energy is not available for purchase during <br />~ these periods, it may be necessary to bypass untreated water, requiring <br />CJl the release of an equivalent amount of water from Imperial Dam to satisfy <br />the treaty obligation. <br /> <br />Recent studies indicate that the 13-sequence average annual energy require- <br />ment over 50 years for the YDP and PRPU is 187 million kWh per year, of <br />which 168 million kWh would be supplied by the Navajo Project. The remaining <br />19 mill ion kWh would have to be purchased from another source or exchanged <br />for Navajo power during surplus energy periods if suitable storage can <br />be found. . <br /> <br />Electric Power Needs <br /> <br />The electric power demand of the desalting plant, including the pretreat- <br />ment system, is estimated to be 28 MW .when operating at full capacity, <br />The project would also be charged for transmission losses, and some <br />additional capacity would be required to offset the difference in plant <br />factors between the desalting plant and the power source, <br /> <br />The desalting plant will have an energy recovery turbine that will operate <br />on the high pressure reject from the reverse osmosis segments, The elec- <br />tric energy which wi 11 be producedi s estimated to be 26 mill i on kWh per <br />year, This energy will be fed directly into the desalting plant switch- <br />yard and will partially offset the total power requirement of the plant. <br /> <br />The use of the Navajo Project Powerp1ant (with an estimated plant factor <br />of 75 percent) as the power source results in the following requirements: <br /> <br />Requirement for Navajo Energy <br /> <br />Item <br /> <br />Annual Energy <br />(kWh) <br />20~,825,OOO <br />18,524,000 <br /> <br />Desalting plant requirement <br /> <br />Transmission losses (9%) 1/ <br /> <br />Additional capacity required to offset <br />difference in plant factors of the <br />desalting plant and Navajo Project <br /> <br />Su btota 1 <br /> <br />4.44 <br />34.75 <br /> <br />o <br />224,349,000 <br /> <br />Credit for output of energy <br />recovery facilities <br /> <br />Total Requirement at Navajo <br />Powerp1ant y <br /> <br />o <br /> <br />(-)26,047,000 <br /> <br />. 34.75 <br /> <br />198,302,000 <br /> <br />11 Five percent for Navajo Project transmission system losses plus <br />4 percent for Federal transmission system losses. <br /> <br />~/ Based on normal energy usage. <br /> <br />16 <br />