WSP02437

• File Number: 8220.100.50
• Description: CRSP - Power Issues
• Basin: Colorado Mainstem
• Date: 1/1/1982
• Author: West. Sys. Coord. Co
• Title: Western Systems Coordinating Council Ten-Year Coordinated Plan Summary 1982 - 1991
• Water Supply Pro - Doc Type: Publication

As of December 31, 1981 the existing generation capability of the
total WSCC region was 120,734 MW. This figure represents an increase in
capacity during 1981 of 1.9 percent (2,230 MW). The principal resource
additions during 1981 included four coal-fired units having a total capacity
of 1,445 MW, fourteen hydro units (250 MW), one pumped storage unit
(100 MW), and three combustion turbine units (405 MW). Several changes in
previously reported generating capability also occurred due to unit
retirements, reratings and other factors. Forty-three percent of the
existing WSCC generation capability is provided by conventional hydro units,
22 percent by oil and gas-fired units, 22 percent by coal-fired units and 3
percent by nuclear units. The remaining generation capability (10 percent)
is provided by various other sources.

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flow mean was approximately 208* MW clockwise, and the loop flow extremes as
recorded at Malin during 1981 were 896* MW clockwise and 828* MW
counterclockwise. The clockwise loop flow extreme for 1981 was 125 MW less
than the largest historical clockwise extreme which was recorded in
December, 1980. The counterclockwise loop flow extreme for 1981 was 42 MW
less than the largest historical counterclockwise extreme, but 177 MW
greater than the 1980 extreme. Requests for schedule curtailments to
control clockwise loop flow were in effect for 1507 hours and requests for
schedule curtailments to control counterclockwise loop flow were in'effect
for 1304 hours, for a total of 2,811 hours, or 32 percent of the year. In
addition to the schedule reductions which were initiated throughout the
region to control loop flow, counterclockwise loop flow adversely impacted
the ability of California systems to import desired power levels from the
Northwest and clockwise loop flow adversely impacted the ability of
California systems to import desired power levels from the Arizona/New
Mexico area.

In concert with the Council's goal of pursuing an equitable and
effective solution to the loop flow problem, a WSCC Executive Committee Loop
Flow Task Force was formed in early 1981 and a consultant retained to
provide guidance as to how WSCC could address the institutional problems and
policy questions associated with the problem. The Consultant has proposed
that compensation be provided to ease the burdens associated with
transmission losses and the curtailment of schedules due to loop flow. A
Technical Advisory Group has been formed to complete the technical work
required to evaluate the proposed solutions during 1982.

SIGNIFICANT FACILITY ADDITIONS OR DELAYS

* Loop flow values quoted include inadvertent flow