WSP01318

• File Number: 8220.101.08
• Description: Glen Canyon Dam/Lake Powell
• State: AZ
• Basin: Colorado Mainstem
• Date: 5/1/1994
• Author: Western Area Power A
• Title: Glen Canyon Dam Interim Operations - Estimated Net Expense - December 1993 through March 1994
• Water Supply Pro - Doc Type: Report/Study

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B. Purchases

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A comparison of Base Case purchases to Actual purchases are
summarized below:

Energy Purchase Comparison
Simulated
Base Case Actua 1
Months Purchases Purchases Differences
December 1993 92,409 MWh 26,865 MWh 65,544 MWh
Janaury 1994 93,988 MWh 47,492 MWh 46,496 MWh
February 1994 98,223 MWh 84,278 MWh 13,945 MWh
March 1994 128,707 MWh 125,803 MWh 2,904 MWh

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For December 1993 through March 1994, actual purchases were less
than simulated Base Case purchases. This is due to a shift in
deficits from onpeak to offpeak hours in the Base Case, resulting in
higher purchases during offpeak hours.

C. Economy Energy Sales (Surplus)

For all months, actual nonfirm energy sales were less than projected
for Base Case conditions. Revenues foregone are estimated below:

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ENERGY SALES AND REVENUES FOREGONE
Months Base Case Actual Revenues Foregone
December 1993 $1 ,789,425 $314,708 $1,474,717
January 1994 1,014,665 104,739 909,926
February 1994 237,303 204 237,099
March 1994 56,658 2,818 53,840

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D. Average Purchase Prices--Base Case and Actual

The average monthly purchase price estimates are derived from the
actual nonfirm energy purchase prices. With the help of the Power
Control staff (Montrose), some of the higher purchase prices for all
months that are associated directly with interim release
constraints, were excluded. An adjusted weighted average of
remaining purchase amounts and prices are rendered to calculate the
base case offpeak and onpeak purchase prices.

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