The ERCOT planned maintenance outage completed at approximately  1:49 PM today, Sunday, May  18, 2008. All systems and transaction processing were reinstated at that time.

As always, connectivity issues such as NAESB or TML can be reported to the ERCOT Help Desk at 512-248-6800 or [log in to unmask] or tomorrow to your ERCOT Account Manager.

VS

---

From: ERCOT Client Relations
Sent: Friday, May 16, 2008 2:50 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: M-A051408-02 REMINDER: Outage - Retail/Wholesale - Maintenance outage scheduled for Sunday, May 18, 2008 from 8:00 AM through 8:00 PM

NOTICE DATE:  May 16, 2008

NOTICE TYPE:  M-A051408-02 REMINDER:  Outage - Retail/Wholesale

CLASSIFICATION: Public

SHORT DESCRIPTION:  ERCOT has scheduled a maintenance outage for Sunday, May 18, 2008 from 8:00 AM through 8:00 PM.

INTENDED AUDIENCE:  All Market Participants

DAY AFFECTED:  Sunday, May 18, 2008 from 8:00 AM through 8:00 PM

LONG DESCRIPTION:  ERCOT has scheduled a maintenance outage for Sunday, May 18, 2008 from 8:00 AM through 8:00 PM.

ADDITIONAL INFORMATION:  During the outage the following functions will be affected:

• Market Participants utilizing NAESB to send/receive transactions to/from ERCOT will NOT be able to send/receive transactions to/from ERCOT during the outage.  This includes all retail transactions.
• 867 Transactions will NOT be forwarded during the outage.
• 997 Functional Acknowledgements will NOT be sent during the outage.
• Components of the TML and Commercial API will NOT be available including:

• Find ESI ID
• Find Transaction
• Submit Transactions
• USA Functionalities
• Report Explorer, including
• Reports
• Extracts
• Invoices
• Settlement Statements
• Extract Scheduler
• Web Services Data Requests

• ERCOT Internet Services will NOT be available, including but not limited to:

• ERCOT.com – www.ercot.com
• MarkeTrak - https://marketrak.ercot.com:8443/tmtrack.dll?
• TCR - https://tcr.ercot.com
• Texas Renewables – www.texasrenewables.com

MOS, Scheduling API, MOSTML, MOSPUBLIC, and Outage Scheduler will not be affected as there will be a DNS failover from Taylor to Austin.

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

JA/DP

---

From: ERCOT Client Relations
Sent: Wednesday, May 14, 2008 5:06 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: M-A051408-01 – Retail/Wholesale - Maintenance outage scheduled for Sunday, May 18, 2008 from 8:00 AM through 8:00 PM

NOTICE DATE:  May 14, 2008

NOTICE TYPE:  M-A051408-01 – Retail/Wholesale

CLASSIFICATION: Public

SHORT DESCRIPTION:  ERCOT has scheduled a maintenance outage for Sunday, May 18, 2008 from 8:00 AM through 8:00 PM.

INTENDED AUDIENCE:  All Market Participants

DAY AFFECTED:  Sunday, May 18, 2008 from 8:00 AM through 8:00 PM

LONG DESCRIPTION:  ERCOT has scheduled a maintenance outage for Sunday, May 18, 2008 from 8:00 AM through 8:00 PM.

ADDITIONAL INFORMATION:  During the outage the following functions will be affected:

• Market Participants utilizing NAESB to send/receive transactions to/from ERCOT will NOT be able to send/receive transactions to/from ERCOT during the outage.  This includes all retail transactions.
• 867 Transactions will NOT be forwarded during the outage.
• 997 Functional Acknowledgements will NOT be sent during the outage.
• Components of the TML and Commercial API will NOT be available including:

• Find ESI ID
• Find Transaction
• Submit Transactions
• USA Functionalities
• Report Explorer, including
• Reports
• Extracts
• Invoices
• Settlement Statements
• Extract Scheduler
• Web Services Data Requests

• ERCOT Internet Services will NOT be available, including but not limited to:

• ERCOT.com – www.ercot.com
• MarkeTrak - https://marketrak.ercot.com:8443/tmtrack.dll?
• TCR - https://tcr.ercot.com
• Texas Renewables – www.texasrenewables.com

MOS, Scheduling API, MOSTML, MOSPUBLIC, and Outage Scheduler will not be affected as there will be a DNS failover from Taylor to Austin.

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

JA/DG