NOTICE DATE: September 25, 2008

NOTICE TYPE: M-A092508-01 Outage - Retail/Wholesale

CLASSIFICATION: Public

SHORT DESCRIPTION: Scheduled Maintenance Outage

INTENDED AUDIENCE: All Market Participants

DAY AFFECTED: Sunday, October 5, 2008 from 8:00 AM through 8:00 PM

LONG DESCRIPTION: ERCOT has scheduled a maintenance outage for Sunday, October 5, 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

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].

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