NOTICE DATE:  April 14, 2009

NOTICE TYPE: R-A041309-01 Outage Notice – Retail Processing

SHORT DESCRIPTION: ERCOT experienced an outage of the Electronic Data Interchange (EDI) mapping servers from 5:35 PM to 6:15 PM on April 13, 2009.

INTENDED AUDIENCE: LSEs and TDSPs

DAY AFFECTED: April 13, 2009 from 5:35 PM to 6:15 PM

LONG DESCRIPTION:  ERCOT experienced an outage of the Electronic Data Interchange (EDI) mapping servers from 5:35 PM to 6:15 PM on April 13, 2009.

The EDI Mapping services stopped on all four processor servers.  Alerts for this issue were not generated as expected.

ADDITIONAL INFORMATION:  Processing resumed at 6:15 PM and ERCOT has found no processing errors.  The root cause is not yet determined.

At no time was NAESB affected, and all files were received from Market Participants without interruption.

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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JR/DP