NOTICE DATE: April 2, 2010

NOTICE TYPE: R-A033010-04 FINAL - Retail Processing

SHORT DESCRIPTION: ERCOT has successfully implemented an emergency SIR for the invalid mapping status failures related to the weekend outage and self-selected switches.

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Sunday, March 28, 2010 – Wednesday, March 31, 2010

LONG DESCRIPTION: On Wednesday, March 31, 2010, ERCOT successfully implemented an emergency SIR for the invalid mapping status failures related to the weekend outage and self-selected switches.

The volume of impacted switches is 682. ERCOT completed reprocessing of affected 814_04 transactions on Thursday, April 1, 2010.

ERCOT is continuing to work with affected market participants to identify transactions which could potentially cause out-of-synch conditions. ERCOT Initiated MarkeTrak issues are being opened with affected Market Participants.

ADDITIONAL INFORMATION: Affected Market Participants received lists of reprocessed transactions on April 1, 2010. MarkeTrak issues are continuing to be opened as out of synch situations are identified. Updated lists will be sent to affected Market Participants as issues are identified.

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: Thursday, April 01, 2010 5:23 PM
To: [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]; 1 ERCOT Client Service Reps
Subject: R-A033010-03 UPDATE - Retail Processing

NOTICE DATE: April 1, 2010

NOTICE TYPE: R-A033010-03 UPDATE - Retail Processing

SHORT DESCRIPTION: ERCOT has successfully implemented an emergency SIR for the invalid mapping status failures related to the weekend outage and self-selected switches.

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Sunday, March 28, 2010 – current

LONG DESCRIPTION: ERCOT successfully implemented an emergency SIR for the invalid mapping status failures related to the weekend outage and self-selected switches on March 31, 2010.

ADDITIONAL INFORMATION: ERCOT is continuing to identify impacted transactions related to this incident. Affected MPs have been sent initial e-mails with MarkeTrak issues opened for them. Additional e-mails will be sent on April 2, 2010 detailing further impacts.

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/DP

From: ERCOT Client Relations
Sent: Wednesday, March 31, 2010 4:42 PM
To: [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]; 1 ERCOT Client Service Reps
Subject: R-A033010-02 UPDATE - Retail Processing

NOTICE DATE: March 31, 2010

NOTICE TYPE: R-A033010-02 UPDATE - Retail Processing

SHORT DESCRIPTION: ERCOT will be implementing an emergency SIR for the invalid mapping status failures related to the weekend outage and self-selected switches. There will be no outage necessary and no market impact.

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Sunday, March 28, 2010 – current

LONG DESCRIPTION: ERCOT will be implementing an emergency SIR for the invalid mapping status failures related to the weekend outage and self-selected switches. There will be no outage necessary and no market impact.

All 321 self-selected switches impacted by the invalid mapping status failure and received prior to 8:00 AM this morning, March 31, 2010 have been successfully reprocessed and are in either a Scheduled or Complete state. ERCOT is working through the reprocessing of the self-selected switches received after 8:00 AM today, March 31, 2010 and will have them reprocessed before noon (12:00 PM) tomorrow, April 1, 2010.

ADDITIONAL INFORMATION: There were 25 self-selected switches in a Cancelled state prior to the ERCOT reprocessing effort. ERCOT will reach out to the submitting CRs of these individually to request resubmission and/or manual intervention.

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/DP

From: ERCOT Client Relations
Sent: Tuesday, March 30, 2010 12:30 PM
To: [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]; 1 ERCOT Client Service Reps
Subject: R-A0330-01 INITIAL - Retail Processing

NOTICE DATE: March 30, 2010

NOTICE TYPE: R-A0330-01 INITIAL - Retail Processing

SHORT DESCRIPTION: 814_04s on Self Selected Switches are failing mapping status at ERCOT due to incorrect LIN segment in the 814_03 sent to the TDSPs.

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Sunday, March 28, 2010 – current

LONG DESCRIPTION: As result of Project 90024 which was implemented in this past weekend’s Retail Release, 814_04s on Self Selected Switches are failing mapping status at ERCOT due to incorrect LIN segment in the 814_03 sent to the TDSPs.

ADDITIONAL INFORMATION: ERCOT is currently researching and will provide information when available.

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.

DH/DP