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<br />wA-f>A L <br /> <br />Western Area Power Administration <br />Salt Lake City Area <br /> <br />COMPARISON OF ACTUAL VS. ESTIMATED <br />IMPACTS TO PURCHASE POWER EXPENSES <br />WITH OCTOBER SPECIAL RELEASES <br />AT GLEN CANYON <br /> <br />November 11, 1989 <br /> <br />Estimates of actual additional expenses incurred as a result of the <br />5,000 cfs constant release at Glen Canyon for the period from <br />October 6 through October 9,1989 are summarized in the attached <br />Table 1. Based upon the analysis of actual power system operations <br />during this period, Western conlcudes that an additional expense of <br />$64,000 was incurred for this 4-day period. <br /> <br />An earlier estimates of expenses for this period of special release <br />which was prepared in August, was estimated to be $92,000. This <br />projected expense is summarized in the attached Table 2. <br /> <br />Actual expenses differ from those estimated in August because of the <br />following reasons: <br /> <br />Use of Interchange -- Expenses were reduced since receipt of <br />interchange energy reduced the total purchase power <br />requirements. This interchange was comprised of intra project <br />interchange of approximately 9.2 gWh and interutility <br />interchange of 8.7 gWh. If this interchange had not occurred, the <br />on-peak premium price would have been 28 mills per kWh rather <br />than 21.5 m/kWh. With this higher on-peak purchase rate, <br />expenses could have been as high as $171,500. See Table 3, <br />attached. <br /> <br />Lower Actual Purchase Rates -- Purchase prices both onpeak and <br />offpeak were lower than initially estimated, which resulted in <br />lower net expenses for each day in the 4-day period, with <br />significantly lower expenses on Sunday. <br /> <br />1 <br />