NOTICE DATE: March 4, 2009

NOTICE TYPE: M-A030409-01 Operations

SHORT DESCRIPTION: March 5, 2009 AS Market Cleared

INTENDED AUDIENCE: QSE Operations Personnel

DAY AFFECTED: Operating Day March 4, 2009

LONG DESCRIPTION:  On March 4, 2009 the Day Ahead Ancillary Service (AS) Market Engine initially failed to clear for the Operating Day of March 5, 2009. At approximately 16:20 the Day Ahead AS Market was re-run and successfully cleared.

ERCOT is investigating the issue and will provide more information at the appropriate Working Group as it becomes available.

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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