7416

• UCREFRP Catalog Number: 7416
• Author: U.S. Fish and Wildlife Service.
• Title: Flaming Gorge Aspinall Joint Operations Study December, 15, 1988-Draft.
• USFW Year: 1988.
• USFW - Doc Type: Denver, Colorado.
• Copyright Material: NO

(5) Other power, including such services as emergency and
maintenance services, fuel replacement, and delivering
or receiving power.
In order to balance the goals of insuring Project power customers
a reliable level of capacity and energy and maximizing the level
of marketable resources, Western markets firm capacity at the 90
percent assurance level and energy at the median level. Periods
of full reservoir or high inflow conditions would allow the
additional sale of short-term capacity and energy. Adverse
hydrologic conditions would require the purchase and import of
non-Project power and energy to meet the long-term firm load.
Since Project energy is marketed as a
power resource commitment is demanded
Aspinall Unit at any given hour; howe,
Project resource determines the level
longterm changes in the Flaming Gorge
marketing level, which, in turn could
is operated.
system entity, no specific
from Flaming Gorge or the
ver, the total available
of marketing and how
resource would affect this
affect how the Aspinall Unit
Additionally, transmission line loadings are currently causing
difficulties in delivering generated power to the customer.
Specific Flaming Gorge generation is often required to balance the
line loadings at nearby locations on the power grid. At present,
the spatial distribution of electrical generators, transmission
lines, and electrical use occasionally causes overloading of
transmission lines. An example is the line between Vernal, Utah
and Hayden, Colorado. The solution to this particular problem has
been to increase the generation at either Flaming Gorge or Bonanza
powerplants, typically during on-peak periods. Constraints on the
operation of generation units at Flaming Gorge during these line
loading periods could cause extended power reductions and/or
outages.
Daily Operation
On a daily basis, releases from Flaming Gorge and the Aspinall
Unit can fluctuate rapidly over a wide range of flows to provide
adequate generation to meet Western's power commitments. Lower
releases usually occur at night and on Sunday while the higher
releases occur during the daytime hours, thus matching power
demand patterns. Changes from low to high flows occur at a
specified 'ramping rate', which during normal conditions is
limited to about 100 cfs per hour to reduce the impacts of rapid
stage changes on the Green River below Flaming Gorge Dam.
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