NOTICE DATE: December 3, 2012

NOTICE TYPE: M-A120312-01 Outage – Retail/Wholesale

SHORT DESCRIPTION: Unplanned outage of ERCOT systems

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: December 3, 2012, 01:08 CPT – current

LONG DESCRIPTION: ERCOT experienced an unplanned outage due to a hardware failure, which impacted multiple databases and applications beginning at 01:08 CPT on December 3, 2012. Most systems have been switched to the alternate data center. Retail market systems and MarkeTrak are not functional at this time.

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 email at [log in to unmask].

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