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I i I " j GLEN CANYON DAM INTERIM OPERATIONS Estimated Net Expense December 1993 Through March 1994 I. EXECUTIVE SUMMARY Power SchedulinQ and Real-Time Operations ~. . The Los Angeles earthquake of January 17 severed transmission to several utilities within the northwest and southwest market area, resulting in selling surplus energy from the Los Angeles Department of Water and Power at $18.50jMWh. Western, by purchasing this abundant energy, was able to reduce 50,000 acre-feet from projected releases to be used for the upcoming summer months. . In early February cold weather and unit outages in the Four Corners Area created an energy shortage in which RMGC could only provide 50 MWh out of an agreed 90 MWh. Surplus Navajo generation provided for the lost portion from RMGC. Prices for onpeak non-firm energy escalated to $30jMWh for the week of February 7, in contrast to the average onpeak purchase price of $26.75jMWh for all of February. Analvsis of RampinQ Events , .. , i< t ,~ ~~~. ,'; " ~:~ " ( ;~. . There were 95 deviations: "Control Area Regulation" accounted for most of the anomalies. :"; ~, - ;J ~'..~ I~~ Expenses :c.. :v ~~: . Net expense of interim releases: December 1993 Janaury 1994 . February 1994 March 1994 . . $551,942 $373,668 $465,858 $343,725 :~ .~~ "." :.w ." ,~ ~ ~~ :? ".f-" Power SchedulinQ Concerns (Future) . Expected resumption of the fish release program by BPA from May through July should deliver a surplus of low cost energy to the non- firm energy market. Western has contracted for an allotment of this economical energy to ameliorate the reductions in power generation from the special releases. II. INTRODUCTION On August 1, 1991, former Interior Secretary Manual Lujan implemented interim flows at Glen Canyon Dam. These interim flows were a considerable departure from previous operation of the dam and have had a