WSP09467

• File Number: 8281.990
• Description: Colorado River Studies and Investigations -- Webster Hill Dam and Reservoir
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/1/2001
• Author: Brown and Caldwell
• Title: Technical Memo NO 4A: Analysis of Alternative 4 - New Storage Facility at Webster Hill Site - Mainstem Colorado River
• Water Supply Pro - Doc Type: Report/Study

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Table 4

Estimated Power Revenue

Annual Generation (KwHr) (from Dwyer and Sheperd) 78,000,000
Power Contract Rate ($/KwHr) $ 0,0684
Annual Power Revenue $ 5,335,000
Net Annual Cost After Deductino Power Revenue -$514,000
Net Annual Cost After Deducting Power Revenue/AF for 20,000
AF of vield $12.85/AF
Net Annual Cost After Deducting Power Revenue/AF for 40,000
AF of vield $6.42/AF

Notes:

1) Annual Power Generation is from Dwyer-Sheperd for a 12MW plant operating as a run-of-the-river
facility. This represents power generation for a period of approximately 271 days for 24 hours per
day, a flow through the turbines of 200 cfs, a water to wire efficiency of 70 percent, and an average
head of 50 feet.

2) The sales price of electric power used in this evaluation is $ 68.39/MWHr. These data were
obtained from John Gierard. WAPA and were used in valuation of power generation foregone at
Ruedi Reservoir. The $68.39 is the average sales price for the period of June 2000 through May
2001. See table below.

Actual and Projected Electric Power Prices ($/MWHI
Date Purchase Sale
June 2000 75.44 54.16 actual
Julv 2000 116.54 61.76
Auoust2000 . 115.89 106.93
September 2000 60.47 58.66
October 2000 65.48 38.78
November 2000 71.63 65.02
December 2000 113.19 105.41
Januarv 2001 110.00 130,00 nroiected .
Februarv 2001 70.00 65.00
March 2001 50.00 45.00
April 2001 50.00 45.00
Mav 2001 50.00 45.00 .
Averaoe 79.05 68.39

3) Average annual cost after deducting power revenue = $335,000 - $849,000 = -$514,000.

n:\data\2en\cwcb\19665\a]~emative 4\techmem04\webster hill tables 1-3.doc