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6. Power SchedulinQ and Purchases for September 1994 Water releases from the Glen Canyon powerplant totaled 623,000 AF for the month of September. Weekday generation patterns were pre-scheduled at approximately 8,000 cfs (311 MW) during off-peak periods and approximately 14,000 cfs (543 MW) during on-peak periods. The daily generation fluctuation rate was limited to 6,000 cfs (232 MW) all month. Weekend releases were adjusted downward to follow lower weekend demands. September's weather turned cooler resulting in reduced irrigation demands and reduced Aspinall generation. Purchases were increased to supplement the lost generation. C, Future SchedulinQ Concerns for October 1994-March 1995 Coordination of a spike release from the Glen Canyon powerplant has posed uncertainties for power planning. Western has moved water from the upcoming winter season into April to accommodate (the possibility) of the spike. As a result, there will be lower than normal releases from Glen Canyon Dam for October, November, December 1994, and January, February, and March 1995. In addition to this power reduction, the Aspinall Unit will be generating lower amounts of energy due to reduced runoff conditions in the basin, and Flaming Gorge generation will be reduced due to steady flow studies taking place this winter. This reduction in generation across the CRSP system will place a high demand on the winter economy energy market . to support firm contract commitments. Most of Western's firm energy purchase requirements for the upcoming winter have been supported through contracts, and if these contracts remain reliable, there should be no problems supporting the system's firm load commitments. The energy market in October is soft and is expected to remain unchanged in November. The extra water made available from the Aspinall Unit will be saved until it is needed by the end of November and into December, mitigating some of the lost generation from Glen Canyon. There is still a possibility that some additional generation will be made available from Flaming Gorge for December 1994, January and February 1995. IV. ANALYSIS OF RAMPING EVENTS "I '- ;', :~.:: ,;.;,. ; ,"., ".-'1 .:-l .-.' "~:1 f....' A study was made to analyze hourly release rates which appeared tOi deviate from interim flow criteria. Operational records and logs kept during the study period, April 1, 1994, through September 30, 1994, were reviewed. The operational records and logs are contained within the packet Glen Canyon Dam Interim Flows--Glen Canyon Power Plant Operations, for April 1994 through September 1994 and provide specific explanations for each ramping event. 4