WSP00927

• File Number: 8407.500
• Description: Platte River Basin - River Basin General Publications - Missouri River
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 1/1/1991
• Author: BOR
• Title: Annual Operating Plans - Western Division System - Power Operations - Water Year 1990-1991
• Water Supply Pro - Doc Type: Report/Study

)
~

l' .- I. Q 0
, oj I! .~ )1")

t
t
I
r

WESTERN DIVISION SYSTEM
WATER YEAR 1990 - GENERATION AND PUMP ENERGY

t
t
I
I
t
I
1\
I
I
I
I
I
I
I

The Western Division System (System) boundaries are illustrated in
exhibit I. Total system gross generation for water year 1990
(October-September) was 1,644,800,000 kilowatt-hours (kwh), which was
76 percent of average. Generation was below normal on the Colorado-Big
Thompson Project due to below normal transmountain diversions and was much
below average on the North Platte Project due to an early shutdown of
irrigation releases and very low runoff. Scheduled maintenance at a few
powerplants is ongoing. Table 1 shows the accumulated gross generation for
each powerplant in the Western Division System for water year 1990.

The System power load during water year 1990 was
1,850.4 gigawatt-hours (gwh). This was 94 percent of the forecast load of
1,962.4 gwh used in the AOP. Exhibit 2 graphically summarizes monthly
loads and generation produced for water year 1990.

During most of the water year, heavy power imports were required from other
interconnected power systems and totaled 357.0 gwh. The peak power import
occurred in April due to low inflows, low turbine releases, and
maintenance, and was equal to 61.9 gwh for the month. A System surplus of
power equal to only 0.1 gwh was generated during water year 1990, and this
occurred in February.

The System power revenue totaled $26.5 million during the 1990 water year.

The 1990 water year (October-September) pump energy requirement of
165,200,000 kwh was below normal at 78 percent of average. Below average
pumping at the Willow Creek Pumping Plant on the Colorado-Big Thompson
Project was due to below normal water year inflow. The below normal water
diversion through Mt. Elbert conduit resulted in 69 percent of average
pumping at Mt. Elbert Pumping Plant on the Fryingpan-Arkansas Project. A
summary of the annual pump energy requirements for the System for water
year 1990 is shown in table 2. Monthly generation, pump energy
requirements, and loads for the Pick-Sloan Missouri Basin Program, Western
Division Water and Power System are summarized in table 3,

1