NOTICE DATE: September 21, 2009

NOTICE TYPE: M-A092109-01 Outage – MOSPublic.ercot.com

SHORT DESCRIPTION: MOSPublic outage Saturday, September 19, 2009

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: September 19, 2009, from 5:00 AM to 7:45 AM

LONG DESCRIPTION: The MOSPublic functionality of the ERCOT Website experienced an outage in service from 5:00 AM to 7:45 AM on Saturday, September 19, 2009. The root cause has been identified as excessive load on the application servers. Access to the application was limited 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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