WSP02900

• File Number: 8220.101.08
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 10/1/1994
• Author: Western Area Power A
• Title: Glen Canyon Dam Interim Operations - Estimated Net Expense - April 1994 through Sepyember 1994
• Water Supply Pro - Doc Type: Report/Study

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GLEN CANYON DAM INTERIM OPERATIONS

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Estimated Net Expense
April 1994 Through September 1994

I. EXECUTIVE SUMMARY

Power Schedulinq and Real-time Operations

. In mid-August high temperatures across the region pushed the economy
energy market to the 36-40 mills/kWh range. on August 18 the
Montrose Power Control staff (Montrose) was forced to purchase energy
at 46 mills/kWh, prompting them to advise the Bureau of Reclamation
that Glen Canyon would be run at the maximum 20,000 cfs release rate
due to the unavailability and expense of energy on the system.

Analvsis of Ramoinq Events

. There were Il4 deviations: "Control Area Regulation" accounted for
most of the anomalies.

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Exoenses

. Net expense of interim releases:

April 1994
May 1994 .
June 1994
July 1994
August 1994 .
September 1994

$281,420
$328,093
$421, 262
$510,924
$574,955
$489,742

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Power Schedulinq Concerns (Future)

. 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 spike. It
is expected there will be lower than normal releases from the Glen
Canyon Dam for October 1994 through March 1995.

II. INTRODUCTION

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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
significant impact on the daily operation of Western Area Power
Administration's (Western) Upper Colorado Control Area,

The impacts of this change in dam operations have required Western to
implement new scheduling procedures for its customers, develop interim