NOTICE DATE: April 15, 2009

NOTICE TYPE: R-A041309-02 UPDATE: 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: NAESB was not affected during this time and all files were received from Market Participants without interruption.

A quarterly change of operating system and database passwords resulted in Oracle Listeners momentarily dropping and the EDI mapping server processor engine services abruptly shutting down.

It was also discovered that some EDI to Enterprise Application Integration (EAI) upload errors occurred at the exact time the processor engines went down. These files have since been reprocessed.

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].

If you are receiving e-mail from an ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com.

JR/DH

From: ERCOT Client Relations
Sent: Tuesday, April 14, 2009 11:25 AM
To: [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]
Cc: 1 ERCOT Client Service Reps; [log in to unmask]; [log in to unmask]; [log in to unmask]
Subject: R-A041309-01 Outage Notice - Retail Processing

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.

JR/DP