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 30^th, while executing the Replacement Reserve market for July 1^st, 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 30^th, 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 [log in to unmask].

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