NOTICE DATE:  July 15, 2011

NOTICE TYPE:  M-A071511-01 Outage – Wholesale

SHORT DESCRIPTION:  Real-Time Market and application outages during database upgrade

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  July 24, 2011, 18:20 – 20:30 CDT

LONG DESCRIPTION:  ERCOT will be completing a database upgrade between 18:20 and 20:30 CDT on Sunday, July 24, 2011. The Market Management System (MMS) and Outage Scheduler (OS) submissions and applications will be unavailable for up to 1.5 hours during this database upgrade.

Note that the 1.5 hour outage is scheduled to begin at approximately 18:20 CDT; however, this start time may be delayed depending on the current system conditions. A Hotline call will be made to Market Participants to announce the start of the outage, and another Hotline call will be made at the completion of the outage.

During the outage:

·         Basepoints from SCED will not be created. Resources will be required to follow Emergency Base Points and Load Frequency Control.

·         HRUC at 19:00 CDT will not be executed.

·         Market Submissions via Market Manager, Outage Scheduler and WebServices will be offline.

·         No Real-Time energy prices will be published.

·         Current Day Reports from the OS will not be published for the intervals impacted.

·         Current Day Reports from the MMS will not be available for the intervals impacted and will be retried as applicable.

·         MIS Secure area dashboards and ERCOT.com pricing displays will be impacted during the outage.

ACTION REQUIRED:  QSEs with Resources will need to follow Emergency Basepoints during the outage. All QSEs need to be aware of the timeline changes in HRUC. QSEs and TSPs will need to refrain from making submissions in MMS and OS during the outage period as the submissions will not be accepted.

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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dh