NOTICE DATE:  July 2, 2008

NOTICE TYPE:  W-A070208-01   Operations

CLASSIFICATION: Public

SHORT DESCRIPTION:  RPRS did not solve within the allocated run-time on
June 30, 2008 for the July 1 trade date. 

INTENDED AUDIENCE:  QSEs

DAY AFFECTED:  July 1, 2008

LONG DESCRIPTION:  On June 30th, while executing the Replacement Reserve
market for July 1st, ERCOT did not approve RPRS procurement. The RPRS
market engine timed out before solving.  ERCOT diagnosed the problem to
be a maximum execution time limit.  This limit exists to prevent the
program from attempting to solve an unsolvable case.  RPRS was
programmed to complete execution in 2000 seconds (33 1/3 minutes) and,
on June 30th, did not solve within the allocated time.  The increased
time required may have been related to a change in scheduling
requirements that went into effect July 1st.  The execution time limit
has been increased.

CONTACT:  If you have any questions, please contact your ERCOT Account
Manager. You may also call the general ERCOT Client Services phone
number at (512) 248-3900 or contact ERCOT Client Services via e-mail at
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