NOTICE DATE: November 3, 2008

NOTICE TYPE: R-A103008-04 FINAL: Retail Processing

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Thursday, October 30, 2008 from 3:18 PM through 9:31 PM

LONG DESCRIPTION: ERCOT experienced an internal system processing issue on October 30, 2008, from 3:18 PM through 9:31 PM. As a result, duplicated transactions or possibly bad/invalid data was forwarded to Market Participants.

ERCOT determined that there were 1,033,762 transactions in 71,270 files that were sent out in error.

Root Cause: ERCOT was in the process of setting up a separate disaster recovery environment. The NAESB application was configured to function as Production in the event of a disaster. At 3:18 PM on October 30, 2008, the application was started in error which caused all test transactions in the environment to be sent outbound to the market.

ADDITIONAL INFORMATION: On Saturday, November 1, 2008, ERCOT provided MarkeTrak issue numbers to each impacted Market Participant. The MarkeTrak issues contained transaction level data on duplicate transactions or bad/invalid data for the appropriate Market Participant.

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.

DP/DH

From: ERCOT Client Relations
Sent: Friday, October 31, 2008 2:49 PM
To: [log in to unmask]; [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-A103008-03 UPDATE: Retail Processing

NOTICE DATE: October 31, 2008

NOTICE TYPE: R-A103008-03 UPDATE: Retail Processing

SHORT DESCRIPTION: ERCOT experienced an internal system processing issue Thursday, October 30, 2008, from 3:18 PM through 9:31 PM. As a result, duplicated transactions or possibly bad/invalid data was forwarded to several Market Participants.

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Thursday, October 30, 2008 from 3:18 PM through 9:31 PM

Some of these transactions may have contained a “TS Code” relating to a Mass Transition.

There is currently no Mass Transition taking place.

After further analysis, ERCOT has determined that there were 1,033,762 transactions in 71,270 files that were sent out in error.

ERCOT has provided a spreadsheet to summarize the potential market impact. We hope this will aid Market Participants with their clean-up efforts.

ERCOT continues to perform the analysis to determine which transactions were duplicated or invalid. Duplicates for the purposes of this analysis are transactions that have the same ESIID, Original transaction number, and Tran type as a transaction previously sent. The transaction ID may or may not match the original transaction received. Invalid transactions are those that either does not match a service order previously submitted, or match a transaction previously submitted but the outbound response does not match what occurred originally.

The analysis is being worked based on the scenarios most likely to create out-of-synch situations between ERCOT and the Market Participants. As the analysis is completed, ERCOT will begin logging MarkeTrak issues. ERCOT will provide additional information as it becomes available.

The breakdown by transaction type is as follows:

Transaction Type	Count
814_02	6548
814_03	206856
814_05	113088
814_06	72460
814_08	67188
814_09	2633
814_11	7
814_12	324
814_13	1326
814_14	4
814_17	9829
814_18	7287
814_19	27183
814_20	22124
814_21	23862
814_22	4686
814_24	1628
814_25	14978
814_26	3
814_27	683
814_28	2128
814_29	24
824_02	2482
867FWD	437264
997	9167
Total	1033762

ADDITIONAL INFORMATION: The attached spreadsheet details the potential transaction impact of the different transactions involved.

ERCOT will provide additional information as it becomes available.

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JR/DH/DP

From: ERCOT Client Relations
Sent: Friday, October 31, 2008 10:18 AM
To: [log in to unmask]; [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-A103008-02 UPDATE: Retail Processing

NOTICE DATE: October 31, 2008

NOTICE TYPE: R-A103008-02 UPDATE: Retail Processing

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Thursday, October 30, 2008 from 3:18 PM through 9:31 PM

ERCOT is currently working to identify the erroneous transactions. MarkeTrak issues will be submitted to those MPs impacted with the total volume counts and filenames of the invalid data. ERCOT will follow up on these issues with transaction level detail of potential out of sync conditions as soon as it is available to coordinate a resolution.

Additional information about this issue will be provided as it becomes available.

ADDITIONAL INFORMATION: Some of these transactions may have contained a “TS Code” relating to a Mass Transition.

There is currently no Mass Transaction taking place.

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.

DP/JR

From: ERCOT Client Relations
Sent: Thursday, October 30, 2008 11:13 PM
To: [log in to unmask]; [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-A103008-01 Retail Processing

NOTICE DATE: October 30, 2008

NOTICE TYPE: R-A103008-01 Retail Processing

SHORT DESCRIPTION: Today, October 30, 2008, from 3:18 PM through 9:31 PM, ERCOT experienced an internal system processing issue which sent duplicated transactions or possibly bad/invalid data to Market Participants.

INTENDED AUDIENCE: CRs and TDSPs

DAY AFFECTED: Thursday, October 30, 2008 from 3:18 PM through 9:31 PM

LONG DESCRIPTION: Today, October 30, 2008, from 3:18 PM through 9:31 PM, ERCOT experienced an internal system processing issue which sent duplicated transactions or possibly bad/invalid data to Market Participants.

ERCOT is currently working to identify the erroneous transactions and corresponding Market Participants.

Additional information about this issue will be provided as it becomes available.

ADDITIONAL INFORMATION: Affected Market Participants will be provided lists when they become 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.