NOTICE DATE:  June 24, 2010

NOTICE TYPE:  W-A062410-01 Outage - Wholesale

SHORT DESCRIPTION:  Unscheduled outage of NMMS

INTENDED AUDIENCE:  TDSPs/TSPs

DAY AFFECTED:  June 24, 2010, 15:53 – 17:17

LONG DESCRIPTION:  The Network Model Management System (NMMS) experienced an outage of the production system from 15:53 until 17:17 on June 24, 2010. Technical support has resolved the issue and NMMS is back in service.

CONTACT:  If you have any questions, please forward them to [log in to unmask] or 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