NOTICE DATE:  July 27, 2009

NOTICE TYPE:  M-A072709-01 Outage – Mospublic.ercot.com

SHORT DESCRIPTION: MOS Public outage Saturday, July 25, 2009

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  July 25, 2009, from 4:50 AM to 7:25 AM

LONG DESCRIPTION: The MOS Public functionality of the ERCOT Website experienced an outage in service from 4:50 AM to 7:25 AM on Saturday, July 25, 2009. The root cause has been identified as a server missing a configuration update, which was needed to resolve previous outages, following the July 21, 2009, failover. The configuration was updated and the web services were restarted to restore the application.

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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dh